Dell Precision™ WorkStation 420 Systems User's Guide Introduction System Setup Using the Network Interface Controller Using the Integrated Audio Controller Using the Integrated SCSI Controllers Working Inside Your Computer Installing System Board Options Installing Diskette, LS-120 SuperDisk, Tape, and CD-ROM Drives Installing Hard-Disk Drives Technical Specifications Hardware Configuration Features Troubleshooting Glossary NOTE: You can obtain the latest version of this document from the Dell support Web
Back to Contents Page Using the Integrated Audio Controller: Dell Precision™ WorkStation 420 Systems User's Guide Overview Using Audio Utilities Connecting Audio Devices Installing Audio Drivers Adjusting Volume Overview This section describes how to connect your computer system to external audio devices that use the 32-bit integrated audio controller on your computer's system board.
Microphones Your computer system supports most nondynamic monaural microphones for personal computers. You can purchase a microphone separately from Dell. NOTE: Do not use standard microphones. Use only microphones designed for personal computers. Connect the audio cable from the microphone to the microphone jack (see Figure 1). Record/Playback Devices Your computer system supports a variety of record/playback devices such as cassette players, CD players, radios, stereo systems, VCRs, and tape players.
1. Start the Audio Mixer utility located in the Audio Control program folder. 2. Adjust the slide controls labeled "Master" to adjust the volume and balance for all devices, or adjust the slide controls for an individual device. For detailed instructions on adjusting the volume, see your Windows NT documentation. Using Audio Utilities The operating system installed on your Dell system has its own utilities for playing audio CDs and recording or playing .wav files: l l For Windows 98 and Windows NT 4.
Back to Contents Page Basic Checks: Dell Precision™ WorkStation 420 Systems User's Guide Overview Checking Connections and Switches Backing Up Your Files Look and Listen Basic Checks System Setup Overview If your Dell™ computer system is not working as expected, and if you are not sure what to do, start your troubleshooting with the procedures in this section. This section guides you through basic steps to solve basic computer problems.
. If the problem is resolved, you have corrected a faulty connection. 7. If your monitor is not operating properly, see "Troubleshooting the Monitor." 8. If your keyboard is not operating properly, see "Troubleshooting the Keyboard." 9. If your mouse or printer is not operating properly, see "Troubleshooting I/O Ports." Otherwise, see "Look and Listen." Look and Listen Looking at and listening to your system is important in determining the source of a problem.
You can easily correct certain system problems by verifying the correct settings in System Setup. When you boot your system, your system checks the system configuration information and compares it with the current hardware configuration. If your system hardware configuration does not match the information recorded by System Setup, an error message may appear on your screen. This problem can happen if you changed your system's hardware configuration and forgot to run System Setup.
Back to Contents Page Installing System Board Options: Dell Precision™ WorkStation 420 Systems User's Guide Overview Microprocessor Upgrades Expansion Cards Replacing the System Battery Adding Memory Overview This section describes how to install the following options: l Peripheral Component Interconnect (PCI), redundant arrays of independent disks (RAID), and accelerated graphics port (AGP) expansion cards l System memory l Microprocessor single-edge connector cartridge 2 (SECC2) package This s
12 LVD SCSI connector 13 Primary EIDE connector 14 Standby power LED 15 Control panel connector 16 Power connector (mini tower chassis) 17 Power connector (mini tower chassis) 18 TAPI/modem connector 19 Card cage area fan connector 20 Auxiliary sound input connector 21 PCI/RAID expansion card slot 22 Auxiliary hard-disk drive access LED connector 23 PCI expansion slots 24 AGP Pro50 (4X) graphics slot (desktop chassis), or AGP Pro110 (4X) graphics slot (mini tower chassis) 25 Wake on LAN connector 26 Process
Figure 3 shows the card extension that may occupy PCI slots 1 and 2. The following is a list of valid expansion-card combinations: l One AGP card and five PCI cards. l One AGP card, four PCI cards, and one RAID card.
1 Filler bracket 4. Insert the expansion card into the expansion-card connector. If the expansion card is full-length, insert the front end of the card into the corresponding card guide on the inside front of the chassis as you insert the card into its connector. Insert the card-edge connector firmly into the expansion-card slot. Gently rock the card into the connector until it is fully seated (see Figure 5). Figure 5.
2. If you have a mini tower chassis, remove the AGP card brace according to the instructions in "Removing and Replacing the AGP Card Brace (Mini Tower Chassis Only)." 3. If necessary, disconnect any cables connected to the card. 4. Unscrew the mounting bracket of the card you want to remove. 5. Grasp the card by its outside corners, and ease it out of its connector. 6. If you are not replacing the card, install a metal filler bracket over the empty card-slot opening.
512 MB 256 MB 256 MB C-RIMM C-RIMM 256 MB 64 MB 64 MB 64 MB 64 MB 256 MB 128 MB 128 MB C-RIMM C-RIMM 128 MB 64 MB 64 MB C-RIMM C-RIMM To upgrade memory, perform the following steps. NOTICE: See "Protecting Against Electrostatic Discharge" in your System Information Guide. CAUTION: Before you remove the computer cover, see "Safety First—For You and Your Computer." 1.
1 Securing clips (2) 2 Slot 3 Securing tab Removing a RIMM To remove a RIMM, press the securing clips outward simultaneously until the RIMM disengages from the socket (see Figure 8). It should pop out slightly. NOTICE: To avoid damage to the memory module, press the securing clips with equal force applied at each end of the socket. Figure 8. Removing a RIMM 1 Securing clips (2) Microprocessor Upgrades NOTE: Only the Microsoft® Windows NT® 4.
CAUTION: Before you remove the computer cover, see "Safety First—For You and Your Computer." 1. Remove the computer cover according to the instructions in "Removing the Computer Cover (Desktop Chassis)" or "Removing the Computer Cover (Mini Tower Chassis)." 2. Rotate the power supply as described in "Rotating the Power Supply Away From the System Board (Desktop Chassis)" or "Rotating the Power Supply Away From the System Board (Mini Tower Chassis)." 3. Remove the airflow shroud. 4.
NOTE: If a setup password has been assigned by someone else, contact your network administrator for information on resetting the chassis intrusion detector. 12. If you installed a second processor and your system is running Microsoft Windows NT 4.0, reinstall the operating system. See your Windows NT documentation for instructions. When you reinstall Windows NT 4.0, the operating system detects the second processor. Replacing the System Battery A 3.
you may damage the system board by prying off the socket or by breaking circuit traces on the system board. Pry the battery out of its socket with your fingers or with a blunt, nonconductive object, such as a plastic screwdriver (see Figure 10). Figure 10. System Battery and Battery Socket 1 Battery 2 Battery socket 6. Install the new battery. Orient the battery with the side labeled "+" facing up. Then insert the battery into the socket, and snap it into place. 7.
Back to Contents Page Contacting Dell: Dell Precision™ WorkStation 420 Systems User's Guide Overview Europe Contact Numbers International Dialing Codes Asia and Other Regions Contact Numbers Americas Contact Numbers Overview When you need to contact Dell, use the telephone numbers, codes, and electronic addresses provided in the following sections. "International Dialing Codes" provides the various codes required to make long-distance and international calls.
Germany (Langen) 00 49 6103 Hong Kong 001 852 Not required Ireland (Cherrywood) 16 353 1 Italy (Milan) 00 39 02 Japan (Kawasaki) 001 81 44 Korea (Seoul) 001 82 2 Luxembourg 00 352 — Macau — 853 Not required Malaysia (Penang) 00 60 4 Mexico (Colonia Granada) 95 52 5 Netherlands (Amsterdam) 00 31 20 New Zealand 00 64 — Norway (Lysaker) 00 47 Not required Poland (Warsaw) 011 48 22 Portugal 00 35 — Singapore (Singapore) 005 65 Not required 09/091
Chile call the U.S.A. for sales, customer, and technical assistance Latin America Customer Technical Support (Austin, Texas, U.S.A.) 512 728-4093 512 728-3619 512 728-3883 Sales (Austin, Texas, U.S.A.) 512 728-4397 SalesFax (Austin, Texas, U.S.A.) 512 728-4600 728-3772 Mexico Automated Order-Status System (Austin, Texas, U.S.A.) 512 728-0685 NOTE: Customers in Mexico call the U.S.A. for access to the Automated Order-Status System and AutoTech.
Europe Contact Numbers Area Code Local Number or Toll-Free Number Country (City) Department Name or Service Austria (Vienna) Switchboard 01 491 040 Home/Small Business Sales 01 795676-02 NOTE: Customers in Austria call Langen, Germany for Technical Support and Customer Care.
(Paris/Montpellier) Technical Support 0825 387 270 Customer Care 0825 823 833 Fax 0825 004 701 Switchboard 0825 Switchboard (Alternative) Sales 04 004 700 99 75 40 00 0825 004 700 Technical Support 0825 004 719 Customer Care 0825 338 339 Web site: http://support.euro.dell.com E-mail: web_fr_tech@dell.com Corporate Fax 01 55 94 71 01 Switchboard 01 55 94 71 00 Sales 01 55 94 71 00 Web site: http://support.euro.dell.com E-mail: web_fr_tech@dell.
Web site: http://support.euro.dell.com E-mail: web_it_tech@dell.com Luxembourg NOTE: Customers in Luxembourg call Belgium for sales, customer, and technical assistance.
(Madrid) Technical Support 902 100 130 Customer Care 902 118 540 Switchboard 902 118 541 Fax 902 118 539 Web site: http://support.euro.dell.com E-mail: web_esp_tech@dell.
Asia and Other Regions Contact Numbers Department Name or Service Australia (Sydney) Home and Small Business 1-300-65-55-33 Government and Business toll free: 1-800-633-559 Preferred Accounts Division (PAD) toll free: 1-800-060-889 Customer Care toll free: 1-800-819-339 Corporate Sales toll free: 1-800-808-385 Transaction Sales toll free: 1-800-808-312 Fax toll free: 1-800-818-341 Brunei NOTE: Customers in Brunei call Malaysia for customer assistance.
(Seoul) Sales toll free: 080-200-3777 Customer Service (Penang, Malaysia) 2194-6220 Fax 2194-6202 Switchboard 2194-6000 Macau Technical Support NOTE: Customers in Macau call Malaysia for customer assistance.
Back to Contents Page Diagnostics: Dell Precision™ WorkStation 420 System User's Guide Overview Starting the Dell Diagnostics Features Advanced Testing Before You Start Testing Overview If you experience a problem with your computer, run the Dell Diagnostics before you call Dell for technical assistance. The diagnostics tests check your computer's hardware without additional equipment and without the risk of destroying data.
5. Insert the Dell ResourceCD into the CD-ROM drive. 6. Press to exit system setup and save the change. The computer reboots and the Dell logo screen appears followed by a list of the available languages. NOTE: If you are starting the ResourceCD for the first time on this computer, the ResourceCD Installation window opens to inform you that the ResourceCD is about to begin installation. Click OK to continue. To complete the installation, respond to the prompts offered by the installation program.
Information in the Advanced Testing screen is presented as follows: l Device Groups — Lists the diagnostic test groups in the order they run if you select All from the Run tests menu option To select a test device group, press the up- or down-arrow key to highlight the group. NOTE: The diagnostics may not list in the Device Groups area the names of all components or devices that are part of your computer system. For example, it may not list a printer even though it is connected to your computer.
Back to Contents Page Installing Diskette, LS-120 SuperDisk, Tape, and CD-ROM Drives: Dell Precision™ WorkStation 420 Systems User's Guide Installing a Diskette, LS-120 SuperDisk, Tape, or CD-ROM Drive in a Mini Tower Chassis Installing a Diskette, LS-120 SuperDisk, Tape, or CD-ROM Drive in a Desktop Chassis Installing a Diskette, LS-120 SuperDisk, Tape, or CD-ROM Drive in a Mini Tower Chassis To install a diskette, LS-120 SuperDisk, tape, or CD-ROM drive in the mini tower chassis, perform the following s
of the bracket should be flush with the front of the drive (see Figure 2 ). Figure 2. Attaching the Drive Bracket to the New Drive 1 Bracket tabs (2) 2 Bracket To further ensure proper positioning of the drive in the chassis, insert and tighten all four screws in the order in which the holes are numbered (the holes are marked "1" through "4"). 7. Slide the new drive into the drive bay until the drive snaps securely into place (see Figure 3).
1 DC power cable 2 Power input connector 3 Interface connector 4 EIDE cable 10. For an EIDE device, connect the other end of the interface cable to the interface connector labeled "IDE2" on the system board. For a diskette drive, connect the cable from the drive to the interface connector labeled "FLOPPY" on the system board. Check all cable connections. Fold cables out of the way to provide airflow for the fan and cooling vents. 11. If the 5.
Squeeze the metal tabs that extend from each side of the drive bracket toward each other, and pull the bracket out of the bay (see Figure 5). NOTE: For easier access inside the chassis, you may want to rotate the power supply out of the way temporarily. To do so, see " Rotating the Power Supply Away From the System Board (Desktop Chassis)." Figure 5.
1 5.25-inch drive 7. Connect a DC power cable to the power input connector on the back of the drive (see Figure 8). 8. Connect the appropriate interface cable to the interface connector on the back of the drive (see Figure 8). If your system came with an EIDE CD-ROM or tape drive, use the spare connector on the existing interface cable. Otherwise, use the EIDE interface cable provided in the drive kit.
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Back to Contents Page External Components: Dell Precision™ WorkStation 420 Systems User's Guide Overview Troubleshooting I/O Ports Troubleshooting the Monitor Troubleshooting Basic I/O Functions Troubleshooting the Keyboard Troubleshooting a Parallel Printer Troubleshooting the Mouse Troubleshooting a Serial I/O Device Overview This section provides troubleshooting procedures for equipment that connects directly to the input/output (I/O) panel of your computer, such as your monitor, keyboard, mouse
This procedure determines what kind of mouse problem you have. If a system error message indicates a mouse problem when you start the computer system or if the mouse does not operate as expected, perform the following steps in the order indicated until the problem is resolved: 1. Clean the mouse as instructed in your mouse documentation. Most mice have a ball that can be removed and cleaned of debris by turning the mouse upside down and removing a cover on the bottom of the mouse.
3. Run the parallel printer's self-test. If the test fails, the printer is faulty. If the problem still is not resolved, the system board may be faulty. See "Getting Help" for instructions on obtaining technical assistance. Troubleshooting a Serial I/O Device If the information in "Troubleshooting Basic I/O Functions" indicates that the problem is with a device connected to one of the serial ports, perform the following steps in the order indicated until the problem is resolved: 1.
Back to Contents Page Getting Help: Dell Precision™ WorkStation 420 Systems User's Guide Help Overview Contacting Dell Back to Contents Page
Back to Contents Page Glossary: Dell Precision™ WorkStation 420 Systems User's Guide A • B • C • D • E • F • G • H • I• J • K • L • M • N • O • P • Q • R • S • T • U • V • W • X • Y• Z A A ampere(s) AC alternating current ACPI Advanced Configuration and Power Interface. ACPI enables operating-system-directed power management rather than system BIOS-directed power management. In addition, it provides a generic system event mechanism for Plug and Play and an interface for configuration control.
A copy of a program or data file. As a precaution, you should back up your computer's hard-disk drive on a regular basis. Before making a change to the configuration of your computer, you should back up important start-up files from your operating system. backup battery The backup battery maintains the system configuration, date, and time information in a special section of memory when the system is turned off. base memory Synonym for conventional memory.
byte Eight contiguous bits of information; the basic data unit used by your computer. C C Celsius C-RIMM continuity Rambus inline memory module. Rambus continuity modules are used to populate empty RIMM slots in some systems. cache To facilitate quicker data retrieval, a storage area for keeping a copy of data or instructions. For example, your computer's BIOS may cache ROM code in faster RAM.
cpi characters per inch CPU central processing unit. See also microprocessor. cursor A marker, such as a block, an underscore, or a pointer, that represents the position at which the next keyboard or mouse action will occur. D DAT digital audio tape dB decibel(s) dBA adjusted decibel(s) DC direct current Dell Diagnostics A comprehensive set of diagnostic tests for your Dell computer. To use the diagnostics, you must boot your computer from the Dell Diagnostics Diskette.
Desktop Management Interface. DMI enables the management of your computer system's software and hardware. DMI collects information about the system's components, such as the operating system, memory, peripheral devices, expansion cards, and asset tag. Information about the system's components is displayed as a MIF file or through the Dell Inspector program. DMTF Desktop Management Task Force.
EMC Electromagnetic Compatibility EMI electromagnetic interference EMM expanded memory manager. A utility that uses extended memory to emulate expanded memory on computers with an Intel386™ or higher microprocessor. EMS Expanded Memory Specification EPROM erasable programmable read-only memory ESD electrostatic discharge expanded memory A technique for accessing RAM above 1 MB. To enable expanded memory on your computer, you must use an EMM.
ft foot/feet FTP File Transfer Protocol G g gram(s) G gravities GB gigabyte(s). A gigabyte equals 1,024 megabytes or 1,073,741,824 bytes. graphics coprocessor See coprocessor. graphics mode A video mode that can be defined as x horizontal by y vertical pixels by z colors. group As it relates to DMI, a group is a data structure that defines common information, or attributes, about a manageable component. GUI graphical user interface H h hexadecimal.
ICES Interface-Causing Equipment Standard (in Canada) ICU ISA Configuration Utility I/O input/output. The keyboard is an input device and a printer is an output device. In general, I/O activity can be differentiated from computational activity. For example, when a program sends a document to the printer, it is engaging in output activity; when the program sorts a list of terms, it is engaging in computational activity.
Kbit(s) kilobit(s), 1,024 bits. Kbps kilobit(s) per second key combination A command requiring that you press multiple keys at the same time. For example, you can reboot your computer by pressing the key combination. kg kilogram(s), 1,000 grams. kHz kilohertz, 1,000 hertz. L LAN local area network. A LAN system is usually confined to the same building or a few nearby buildings, with all equipment linked by wiring dedicated specifically to the LAN. lb pound(s) LED light-emitting diode.
MB/sec megabytes per second MBA Managed PC Boot Agent. MBA is a package of multiprotocol preboot firmware and software tools that enables the network administrator to remotely administer software, operating systems, and applications over the network. Mbps megabits per second MBR master boot record memory A computer can contain several different forms of memory, such as RAM, ROM, and video memory.
MS-DOS® Microsoft Disk Operating System MTBF mean time between failures multifrequency monitor A monitor that supports several video standards. A multifrequency monitor can adjust to the frequency range of the signal from a variety of video adapters. mV millivolt(s) N NDIS Network Driver Interface Specification NIC network interface controller NLM NetWare® Loadable Module NMI nonmaskable interrupt. A device sends an NMI to signal the microprocessor about hardware errors, such as a parity error.
A value or option that you specify to a program. A parameter is sometimes called a switch or an argument. partition You can divide a hard-disk drive into multiple physical sections called partitions with the fdisk command. Each partition can contain multiple logical drives. After partitioning the hard-disk drive, you must format each logical drive with the format command. PCI Peripheral Component Interconnect. A standard for local-bus implementation developed by Intel Corporation.
R RAID redundant arrays of independent disks RAM random-access memory. The computer's primary temporary storage area for program instructions and data. Each location in RAM is identified by a number called a memory address. Any information stored in RAM is lost when you turn off your computer. RAMDAC random-access memory digital-to-analog converter RDRAM Rambus dynamic random-access memory read-only file A read-only file is one that you are prohibited from editing or deleting.
synchronous dynamic random-access memory. SDRAM is a memory technology that improves the performance of your system's memory subsystem by reducing the need for wait states. SDRAM devices have a synchronous interface to the devices to which they are connected and are governed by the system clock. These features reduce the need for wait states often required for conventional memory devices to ensure that timing signals have been set up correctly.
system board As the main circuit board, the system board usually contains most of your computer's integral components, such as: l Microprocessor l RAM l Controllers for standard peripheral devices, such as the keyboard l Various ROM chips Frequently used synonyms for system board are motherboard and logic board. system configuration information Data stored in memory that tells a computer what hardware is installed and how the computer should be configured for operation.
without starting any TSR programs. U UL Underwriters Laboratories UMB upper memory blocks. upper memory area The 384 KB of RAM located between 640 KB and 1 MB. If the computer has an Intel386 or higher microprocessor, a utility called a memory manager can create UMBs in the upper memory area, in which you can load device drivers and memory-resident programs. UPS uninterruptible power supply. A battery-powered unit that automatically supplies power to your computer in the event of an electrical failure.
accelerator, to your computer. A VGA feature connector can also be called a VGA pass-through connector. video adapter The logical circuitry that provides—in combination with the monitor—your computer's video capabilities. A video adapter may support more or fewer features than a specific monitor offers. Typically, a video adapter comes with video drivers for displaying popular application programs and operating systems in a variety of video modes.
watt-hour(s) win.ini file A start-up file for the Windows operating system. When you start Windows, it consults the win.ini file to determine a variety of options for the Windows operating environment. Among other things, the win.ini file records what printer(s) and fonts are installed for Windows. The win.ini file also usually includes sections that contain optional settings for Windows application programs that are installed on the hard-disk drive.
Back to Contents Page Installing Hard-Disk Drives: Dell Precision™ WorkStation 420 Systems User's Guide Overview Installing an EIDE Hard-Disk Drive in the Desktop Chassis Installing an EIDE Hard-Disk Drive in the Mini Tower Chassis Installing SCSI Devices Overview You can install two 1.6-inch-high hard-disk drives in the hard-disk drive bracket in the desktop chassis. You can install three 1.6-inch-high, four 1inch-high, or two 1-inch-high and two 1.
1 Hard-disk drive bracket 2 Hinge tabs 3 Drive door handle 4 Drive door 5. Slide the drive into the chosen bay of the bracket, oriented so that the connectors on the back of the drive will face the back of the chassis when the bracket is reinstalled (see Figure 2). 6. Align the four screw holes of the drive and bracket. Insert and tighten the screws that came with your upgrade kit (see Figure 2). Figure 2.
1 Drive cage 2 Drive bracket 3 Tabs 8. Connect a DC power cable to the power input connector on the back of the drive (see Figure 4). Check all connectors to be certain that they are properly cabled and firmly seated. 9. Connect one of the device connectors on the EIDE cable to the 40-pin interface connector on the back of the hard-disk drive. NOTICE: You must match the colored strip on the EIDE cable with pin 1 on the drive's interface connector to avoid possible damage to your system.
13. Enter System Setup, and update Primary Drive 0 or Primary Drive 1. After you update the System Setup settings, reboot the system. 14. Partition and logically format your drive before proceeding to the next step. See the documentation for your operating system for instructions. 15. Test the hard-disk drive by running the Dell Diagnostics. 16. If the drive you just installed is the primary drive, install your operating system on the hard-disk drive.
1 Hooks (3) 2 Screws (4) 3 1-inch drive (back) 4 Drive bracket 7. Reinstall the hard-disk drive bracket in the chassis (see Figure 7). a. Insert the bracket into the chassis by inserting the hooks in the slots on the front of the chassis. b. Lower the bracket to the bottom of the chassis, making sure that the latch on the drive bay is engaged. c. Replace the screw holding the drive bracket to the drive bay. Figure 7.
1 DC power cable 2 Power input connector on drive 3 EIDE cable 4 IDE1 connector 5 Interface connector on drive 10. If it is not already connected, connect the other end of the EIDE cable to the primary EIDE connector (labeled IDE1) on the system board. NOTICE: You must match the colored strip on the EIDE cable with pin 1 on the primary EIDE connector to avoid possible damage to your system. To locate the primary EIDE connector, see Figure 1 in "Installing System Board Options." 11.
SCSI devices installed by Dell are configured correctly during the manufacturing process. You do not need to set the SCSI ID for these SCSI devices. If you attach additional optional SCSI devices, refer to the documentation for each device for information about setting the appropriate SCSI ID number. NOTICE: Dell recommends that you use only SCSI cables purchased from Dell. SCSI cables purchased elsewhere are not guaranteed to work with Dell systems.
of the SCSI device. Connect the other end of the power cable into a standard electrical wall outlet. Check all other cable connections. Fold all internal cables out of the way to provide airflow for the fan or cooling vents. 6. If you installed an externally accessible device, remove the front-panel insert for the drive bay. For a mini tower chassis, you must first remove the front bezel as described in "Removing and Replacing the Front Bezel (Mini Tower Chassis Only).
Back to Contents Page Hardware Configuration Features: Dell Precision™ WorkStation 420 Systems User's Guide Overview I/O Ports and Connectors Jumpers Interrupt Assignments System Board Labels Memory Allocations Overview This section provides specific information about the jumpers on your system board and the input/output (I/O) ports and connectors on the back panel of your computer. It also provides some basic information on jumpers, a listing of interrupt request (IRQ) assignments, and memory maps.
Table 1. System Board Jumpers Settings Jumper Setting Description RTCRST Real-time clock and CMOS reset. Install a jumper plug on these pins for approximately 1 second to reset the contents of the real-time clock and the CMOS. Do not leave the jumper plug installed. PSWD Password features enabled. Password features disabled. NOTE: For the full name of an abbreviation or acronym used in this table, see the Glossary.
MOUSE PS/2 mouse connector NIC 10/100 Ethernet RJ45 connector PANEL Control panel connector PARALLEL/SCSI Parallel connector over Wide SCSI connector (stacked) PCI1, PCI2, PCI3 PCI expansion-card connectors on primary PCI bus PCI4, (PCI5) PCI expansion-card connectors on secondary PCI bus PCI5\RAIDPORT RAID port connector extension to PCI5 RAID Optional RAID PCI expansion card connector extension SCSI_LVD Primary (LVD/Wide) SCSI connector SCSI_NARROW Secondary (Narrow) SCSI connector SER
Port designations are used, for example, in software installation procedures that include a step in which you identify the port to which your printer is attached, thus telling your software where to send its output. (An incorrect designation prevents the printer from printing or causes scrambled print.) Serial Port Connectors If you reconfigure your hardware, you may need pin number and signal information for the serial port connectors.
11 BUSY I Busy 12 PE I Paper end 13 SLCT I Select 14 AFD# O Automatic feed 15 ERR# I Error 16 INIT# O Initialize printer 17 SLIN# O Select in 18-25 GND N/A Signal ground External SCSI Connector The 68-pin external small computer system interface (SCSI) connector on the system back panel supports external Ultra SCSI devices such as scanners, zip drives, and optical drives.
57 BSY I/O SCSI busy 58 ACK I/O SCSI acknowledge 59 RST I/O SCSI reset 60 MSG I/O SCSI message 61 SEL I/O SCSI select 62 C/D I/O SCSI command/data 63 REQ I/O SCSI request 64 I/O I/O SCSI in/out 65 D8 I/O SCSI data bit 8 66 D9 I/O SCSI data bit 9 67 D10 I/O SCSI data bit 10 68 D11 I/O SCSI data bit 11 Keyboard and Mouse Connectors Overview Your system uses a Personal System/2 (PS/2)-style keyboard and supports a PS/2-compatible mouse.
Table 7. Pin Assignments and Interface Signals for the Mouse Connector Pin Signal I/O Definition 1 MFDATA I/O Mouse data 2 NC N/A No connection 3 GND N/A Signal ground 4 FVcc N/A Fused supply voltage 5 MFCLK I/O Mouse clock 6 NC N/A No connection Video Connector For information on your video connector, see the manufacturer's specifications that came with your video card.
2 DATA I Data in 3 +DATA O Data out 4 GND N/A Signal ground Microphone Jack You can use the microphone jack (see Figure 11) to attach a nondynamic monaural microphone for personal computers. Connect the audio cable from the microphone to the microphone jack. The microphone input is a mono source with maximum signal levels of 130 millivolts root mean squared (mVrms). Figure 11. Microphone Jack Line-Out Jack You can use the line-out jack (see Figure12) to attach most computer speakers.
IRQ4 COM1 and COM3 serial ports (if enabled in System Setup program) IRQ5 Available IRQ6 Diskette drive interface IRQ7 Parallel port (if enabled in System Setup program) IRQ8 RTC IRQ9 Available IRQ10 Available IRQ11 Available IRQ12 Mouse controller IRQ13 Math coprocessor IRQ14 Primary EIDE interface (if enabled in System Setup program) IRQ15 Secondary EIDE interface (if enabled in System Setup program) NOTE: For the full name of an abbreviation or acronym used in the table, see the G
000F0000-000FFFFF System BIOS 00100000-0010FFEF High memory area 0010FFF0-3FFFFFFF Extended memory 40000000-FFF7FFFF Reserved FFF80000-FFFFFFFF BIOS ROM NOTE: For the full name of an abbreviation or acronym used in this table, see the Glossary.
Back to Contents Page Help Overview: Dell Precision™ WorkStation 420 Systems User's Guide Technical Assistance Product Information Help Tools Returning Items for Warranty Repair or Credit Problems With Your Order Before You Call Technical Assistance If you need assistance with a technical problem, perform the following steps: 1. Run the Dell Diagnostics as described in "Dell Diagnostics." 2. Make a copy of the Diagnostics Checklist and fill it out. 3.
http://www.euro.dell.com (for Europe only) l Anonymous file transfer protocol (FTP) ftp.dell.com/ Log in as user: anonymous, and use your e-mail address as your password. l Electronic Support Service support@us.dell.com apsupport@dell.com (for Asian/Pacific countries only) support.euro.dell.com (for Europe only) l Electronic Quote Service sales@dell.com apmarketing@dell.com (for Asian/Pacific countries only) l Electronic Information Service info@dell.
Product Information If you need information about additional products available from Dell, or if you would like to place an order, visit Dell's World Wide Web site at http://www.dell.com. For the telephone number to call to speak to a sales specialist, see "Contacting Dell." Returning Items for Warranty Repair or Credit Prepare all items being returned, whether for repair or credit, as follows: 1. Call Dell to obtain an authorization number, and write it clearly and prominently on the outside of the box.
Refer to your operating system documentation to determine the contents of the system’s start-up files. If the computer is connected to a printer, print each file. Otherwise, record the contents of each file before calling Dell.
Back to Contents Page Working Inside Your Computer: Dell Precision™ WorkStation 420 Systems User's Guide Overview Replacing the Computer Cover (Mini Tower Chassis) Before You Begin Removing and Replacing the AGP Card Brace (Mini Tower Chassis Only) Removing the Computer Cover (Desktop Chassis) Inside Your Computer Replacing the Computer Cover (Desktop Chassis) Rotating the Power Supply Away From the System Board (Desktop Chassis) Removing the Computer Cover (Mini Tower Chassis) Rotating the Power
Removing the Computer Cover (Desktop Chassis) 1. Turn off your computer and peripherals, and make sure that you unplug the computer from its electrical outlet before you remove the computer cover. Observe the Caution for Your Personal Safety and Protection of Your Equipment. Also observe the safety instructions found in your System Information Guide. 2. If you have installed a padlock through the padlock ring on the back panel (see Figure 1), remove the padlock. Figure 1.
1 Release button (two, one each side) 6. If you are using a padlock to secure your system, reinstall the padlock. NOTE: After you remove and replace the cover, the chassis intrusion detector causes the following message to be displayed at the next system start-up: ALERT! Cover was previously removed. 7. Reset the chassis intrusion detector by entering the System Setup program and setting Chassis Intrusion to Enabled or Enabled-Silent.
Figure 5. Removing the Computer Cover (Mini Tower Chassis) 1 Release button Removing and Replacing the Front Bezel (Mini Tower Chassis Only) To access some drive bays in the mini tower chassis, you must first remove the front bezel. To remove the front bezel, you first must remove the computer cover (see " Removing the Computer Cover (Mini Tower Chassis)"). With the cover removed, release the bezel by pressing the tab release marked with the icon (see Figure 6). Figure 6.
To replace the computer cover, perform the following steps: 1. Check all cable connections, especially those that might have come loose during your work. Fold cables out of the way so that they do not catch on the computer cover. Make sure cables are not routed over the drive cage—they will prevent the cover from closing properly. 2. Check to see that no tools or extra parts (including screws) are left inside the computer's chassis. 3.
1 Card guide (front of chassis) 2 AGP card brace 3 Card brace spring 4 Screw 5 Plastic card guide 6 Slot 7 Tab 3. Slide the brace toward the front of the system until it disengages from the slot in the card guide; then rotate the brace up and lift it away from the chassis. To replace the brace, perform the following steps: 1. Insert the tab on the end of the brace into the slot in the card guide at the front of the chassis (see Figure 8). 2.
1 Externally accessible drive bays 2 Hard-disk drive bracket 3 Power supply 4 System board Figure 11 shows a desktop chassis computer with its cover removed. Refer to this illustration to locate interior features and components of the desktop chassis discussed in this guide. Figure 11.
To access some components on the system board, you may have to rotate the system power supply out of the way. To rotate the power supply, perform the following steps. CAUTION: Before you remove the computer cover, see "Safety First—For You and Your Computer." 1. Remove the computer cover as instructed in "Removing the Computer Cover (Desktop Chassis)." 2. Disconnect the AC power cable from the AC power receptacle on the back of the power supply (see Figure 12). 3.
1 Power supply release handle 2 Power supply To return the power supply to its original position, perform the following steps. 1. Rotate the power supply to its original position and hold it there (see Figure 14). 2. Rotate the power supply release handle towards the back of the system until it is closed. Make sure that the handle latches onto the power supply properly and the power supply slides slightly to the back of the system and locks in place. 3. Replace the cover. 4.
Back to Contents Page Internal Components: Dell Precision™ WorkStation 420 Systems User's Guide Overview Troubleshooting Expansion Cards Safety First—For You and Your Computer Troubleshooting System Memory Removing and Replacing the Computer Cover Troubleshooting the Video Subsystem Troubleshooting a Wet Computer Troubleshooting the System Board Troubleshooting a Damaged Computer Troubleshooting a Dead System Board With the RTCRST Jumper Troubleshooting the Battery Troubleshooting Drives Overvi
Safety First—For You and Your Computer The procedures in this section require that you remove the cover and work inside your computer. While working inside your computer, do not attempt to service the computer except as explained in this guide and elsewhere in Dell™ documentation. Always follow the instructions closely. Working inside your computer is safe—if you observe the following precautions.
9. Replace the computer cover and reconnect the system to an electrical outlet. Also, reconnect any telephone or telecommunication lines to the computer. 10. Insert the Dell Precision ResourceCD into the CD-ROM drive, reboot the system, and run the System Board Devices test group in the Dell Diagnostics. If the tests complete successfully, your system is operating properly. If any of the tests fail, see "Getting Help" for instructions on obtaining technical assistance.
Troubleshooting Expansion Cards NOTE: Dell Precision WorkStation 420 systems are equipped with diagnostic LEDs to help provide information about possible problems. Make note of any LED codes you observe before contacting Dell for technical assistance. If an error message indicates an expansion-card problem or if an expansion card seems to perform incorrectly or not at all, the problem could be a faulty connection, a conflict with software or other hardware, or a faulty expansion card.
If the Dell Diagnostics identifies a faulty RIMM, replace that RIMM. If the Dell Diagnostics determines that the system board is faulty, or if the Dell Diagnostics does not identify the cause of the problem and the problem is still not resolved, see "Getting Help" for instructions on obtaining technical assistance. Troubleshooting the Video Subsystem NOTE: Dell Precision WorkStation 420 systems are equipped with diagnostic LEDs to help provide information about possible problems.
1. Turn off the system, including any attached peripherals, and disconnect all the AC power cables from their electrical outlets. Also, disconnect any telephone or telecommunication lines from the computer. CAUTION: Before you remove the computer cover, see "Safety First—For You and Your Computer." 2. Remove the computer cover. 3. If you have a mini tower chassis, remove the AGP card brace according to the instructions in "Removing and Replacing the AGP Card Brace." 4.
Back to Contents Page Introduction: Dell Precision™ WorkStation 420 Systems User's Guide Overview Front Panel System Features Back Panel Important Note to Microsoft Windows 98 and Windows NT 4.0 Users Getting Help Overview Dell Precision WorkStation 420 systems are high-speed, upgradable workstations, designed around Intel® Pentium® III slot 1 microprocessors. These systems support the high-performance Peripheral Component Interconnect (PCI) bus and the accelerated graphics port (AGP) bus.
can be connected and disconnected while the system is running. USB functionality requires an operating system that supports USB, such as Windows 98. Windows NT 4.0 Service Pack (SP) 5 and earlier do not support USB; however, your Dell Precision WorkStation 420 system supports a USB keyboard through its BIOS. l l l A modular computer chassis with a minimum number of screws for easy disassembly and improved serviceability. A high-speed, high-resolution AGP or PCI video card.
l Dell Diagnostics for evaluating the computer's components and devices. l Network device drivers for several network operating systems. These drivers are described in "Using the Network Interface Controller." l (For systems with Microsoft Windows 98, Windows NT, or Windows 2000 only) Desktop Management Interface (DMI) support for managing the computer system. DMI defines the software, interfaces, and data files that enable the system to determine and report information about system components.
l Windows 98 CD from Dell l Dell Precision ResourceCD l SCSI boot diskette See the Dell Microsoft Windows 98 Setup Guide for general installation information for Windows 98 and for information about other drivers or supplements that may be required. For installation instructions for the various drivers, see the document reccommended in the following list: l Windows 98 SCSI controller drivers — See the documentation that came with your Dell Precision ResourceCD.
1 Reset button 2 Power button 3 Power indicator 4 Diskette-drive access indicator 5 Hard-disk drive access indicator Figure 2. Mini Tower Chassis Front Panel 1 Diskette-drive access indicator 2 Power button 3 Reset button 4 Hard-disk drive access indicator 5 Power indicator 6 Chassis door latch release button Back Panel The computer's back panel contains various ports and connectors for attaching external devices and includes a security cable slot.
chassis) for attaching commercially available theft-deterrent devices. Security cables for personal computers usually include a segment of galvanized cable with an attached locking device and key. To prevent unauthorized removal of the computer, loop the cable around an immovable object, ensure the padlock ring is in its closed position, insert the locking device into the security cable slot on the back of the computer, and lock the device with the key provided.
Back to Contents Page Messages and Codes: Dell Precision™ WorkStation 420 Systems User's Guide Overview Diagnostics Messages System Messages Diagnostic LEDs System Beep Codes Simple Network Management Protocol (SNMP) Platform Event Traps Warning Messages Overview Your application programs, operating system, and the computer itself are capable of identifying problems and alerting you to them. When a problem occurs, a message may appear on your monitor screen or a beep code may sound.
Alert! Previous system fan failure. System fan failed or was blocked during the previous operating session. Ensure that an operational system fan is installed, connected to the system board, and that chassis ventilation slots are not blocked. Alert! Previous temperature failure at Processor 0. Processor 0 exceeded its recommended operating temperature range during the previous operating session.
faulty or improperly seated. Diskette drive 0 seek failure Diskette drive 1 seek failure A cable may be loose, or the system See "Troubleshooting Drives." configuration information may not match the hardware configuration. Diskette read failure A cable may be loose, or the diskette may be faulty. See "Troubleshooting Drives." Diskette subsystem reset failed The diskette drive controller may be faulty. Run the Diskette tests in the Dell Diagnostics. Drive not ready No diskette is in the drive.
may be corrupted. information. If the message persists, reinstall your operating system. See the documentation that came with your operating system. No timer tick interrupt A chip on the system board might be Run the System Board Devices tests in malfunctioning. the Dell Diagnostics. Non-system disk or disk error The diskette in drive A or your harddisk drive does not have a bootable operating system installed on it. A nonbootable diskette is in drive A.
Write fault on selected drive NOTE: For the full name of an abbreviation or acronym used in this table, see the Glossary. System Beep Codes When errors occur during a boot routine that cannot be reported on the monitor, your computer may emit a series of beeps that identify the problem.
4-4-3 Math-coprocessor test failure Run the System Board Devices tests in the Dell Diagnostics. 5-2-2-1 Mismatch RDRAM device count; unsupported RIMM device count or technology Replace RIMM pair with supported matching device count. 5-2-2-2 Mismatch RDRAM technology or timing pair; unsupported RIMM timing Replace RIMM pair with matching technology and timing. 5-2-2-3 RDRAM levelization failure Reseat RIMMs and C-RIMMs or replace faulty or unsupported RIMMs.
a single beep that signifies the start of normal operation. If the system fails to emit the single beep or appears to stop responding during POST, a series of LEDs located at the back of the computer can help you understand which POST test failed or why the system stopped responding. These LEDs indicate problems encountered during POST only, not during normal operation. The LED patterns described in Table 4 can help you determine what to do to resolve the problem.
S9 Possible system board failure Remove any internal options recently added and restart the system to retest. S11 Possible system board resource conflict Remove any internal options recently added and restart the system to retest. S12 Possible system board resource conflict Remove any internal options recently added and restart the system to retest. S14 Possible system board resource conflict Remove any internal options recently added and restart the system to retest.
Back to Contents Page Using the Network Interface Controller: Dell Precision™ WorkStation 420 Systems User's Guide Overview Connecting to a Network Reinstalling the NIC Drivers Overview This section describes how to connect your computer system to an Ethernet network using the integrated 3Com® Peripheral Component Interconnect (PCI) 3C920 (3C905C-TX compatible) network interface controller (NIC).
Connecting to a Network To connect your system to and configure it for use on an Ethernet network, perform the following steps: 1. Connect the network cable to the back of your computer. 2. Verify that the NIC is enabled in the System Setup program. 3. Install the network driver, if necessary. For instructions, see the documentation that came with your Dell Precision Resource CD. 4. Run the Network Interface Test Group in the Dell™ Diagnostics to verify that the NIC is operating properly.
Temporary file. Delete before release.
Back to Contents Page Using the Integrated SCSI Controllers: Dell Precision™ WorkStation 420 Systems User's Guide Overview Reinstalling SCSI Drivers SCSI Device Considerations Overview This section provides instructions for installing drivers for the integrated dual-channel Adaptec 7899 Ultra160/m low-voltage differential (LVD) small computer system interface (SCSI) controller.
Figure 2. Internal Drive Bays (Mini Tower Chassis) 1 Four-bay hard-disk drive cage (internal) See "Installing SCSI Devices" for detailed information about installing drives in the externally accessible or internally accessible drive bays. Reinstalling SCSI Drivers Dell installed the SCSI drivers for your system on your system's hard-disk drive. Backup copies of these drivers are provided on the Dell Precision ResourceCD.
Back to Contents Page System Setup Options: Dell Precision™ WorkStation 420 Systems User's Guide AC Power Recovery Primary Video Controller Asset Tag Remote Wake Up Auto Power On Report Keyboard Errors Boot Sequence Second Processor CPU Information System Data Diskette Drive A and Diskette Drive B System Date Integrated Devices System Memory Keyboard NumLock System Security PCI IRQ Assignment System Time Primary Drive n and Secondary Drive n ZIP Floppy Support AC Power Recovery AC Power
to boot from the next device in the boot sequence list. Hard-Disk Drive Selecting Hard-Disk Drive causes the system to attempt to boot first from the hard-disk drive and then from the next device in the boot sequence list. IDE CD-ROM Device Selecting IDE CD-ROM Device causes the system to try booting from an IDE CD-ROM drive first. If it does not find a CD in the drive, the system tries to boot from the next device in the boot sequence list.
For LS-120 SuperDisk drives installed in place of a 1.44-MB diskette drive, set these options to Not Installed. If your system has a 1.44-MB diskette drive as Diskette Drive A and you install an LS-120 SuperDisk drive in one of the lower externally accessible drive bays, the system automatically assigns drive letter B to it.
Mode You can set this option to PS/2 (the default) , EPP, ECP, AT, or Off to disable the port. Set this option according to the type of peripheral device connected to the parallel port. To determine the correct mode to use, see the documentation that came with the device. I/O Address This option determines the I/O address used by the parallel port and appears except when Mode is set to Off. You can set I/O Address to 378h (the default), 278h, or 3BCh.
to 84-key keyboards). When Num Lock mode is activated, the rightmost bank of keys on your keyboard provides the mathematical and numeric functions shown at the tops of the keys. When Num Lock mode is turned off, these keys provide cursor-control functions according to the label on the bottom of each key. PCI IRQ Assignment PCI IRQ Assignment specifies which IRQ lines are assigned to the Peripheral Component Interconnect (PCI) devices installed in the computer. Press to configure these devices.
NOTE: You can use the User 1 and User 2 drive types for both the Primary and Secondary Drive 0 and Drive 1 options. However, if you select the User 1 or User 2 drive type, you may not obtain optimum hard-disk drive performance. Also, you cannot use the User 1 and User 2 drive types for hard-disk drives with a storage capacity that is greater than 528 megabytes (MB). Primary Video Controller Primary Video Controller determines whether the system looks for a video card in a PCI slot during the boot routine.
System Security configures the following password and chassis intrusion options: l System Password l Password Status l Setup Password l Chassis Intrusion l CPU Serial Number Press to configure these options as explained in the following subsections. System Password System Password displays the current status of your system's password security feature and allows you to assign and verify a new password.
select Reset, and then choose Enabled, Enabled-Silent, or Disabled. NOTE: When the setup password is enabled, you must know the setup password before you can reset the Chassis Intrusion option. CPU Serial Number CPU Serial Number determines whether the microprocessor serial number(s) (if any) is provided to programs that request it. When Enabled is selected, the system provides the microprocessor serial number(s) to programs that request it.
Back to Contents Page Software Checks: Dell Precision™ WorkStation 420 Systems User's Guide Overview Program Conflicts Installing and Configuring Software Memory Address Conflicts Error Messages Interrupt Assignment Conflicts Input Errors Overview Because most computers have several application programs installed in addition to the operating system, isolating a software problem can be confusing. Software errors can also appear to be hardware malfunctions at first.
Program Conflicts Some programs may leave portions of their setup information behind, even though you have exited from them. As a result, other programs cannot run. Rebooting your system can confirm whether or not these programs are the cause of the problem. Programs that use specialized subroutines called device drivers can also cause problems with your computer system.
Back to Contents Page Technical Specifications: Dell Precision™ WorkStation 420 Systems User's Guide Microprocessor Graphics and Video System Information Key Combinations Expansion Bus Controls and Indicators Memory Power Drives Physical Ports and Connectors Environmental Microprocessor Microprocessor type dual Intel® Pentium® III microprocessors with a front-side bus external speed of 133 megahertz (MHz). See System Setup to identify your system's processor speed.
Mini tower chassis five PCI expansion-card connectors PCI expansion-card connector size 120 pins PCI expansion-card connector data width (maximum) 32 bits Memory Architecture Rambus dynamic random-access memory (RDRAM) technology Rambus in-line memory module (RIMM) slots four (dual channels) RIMM module capacities 64-, 128-, 256-, and 512-megabyte (MB) 800-MHz Rambus DRAM with error checking and correction (ECC) Minimum and maximum total RDRAM capacities 128 MB to 2 gigabytes (GB) BIOS address
Primary EIDE hard-disk drive 40-pin connector Secondary EIDE hard-disk drive 40-pin connector Diskette drive 34-pin connector Remote Wake Up 3-pin connector Audio 4-pin CD-IN connector, 4-pin AUX pocket connector; and 4-pin TAPI pocket connector Fans 3-pin connectors Graphics and Video Graphics architecture: Desktop chassis Mini tower chassis AGP Pro50 (4X) video card (see manufacturer's specifications) AGP Pro110 (4X) video card (see manufacturer's specifications) Key Combinations
Physical Desktop chassis: Height 16.5 centimeters (cm) (6.5 inches) Width 44.2 cm (17.4 inches) Depth 45 cm (17.7 inches) Weight 10.9 kilograms (kg) (24 pounds [lb]) Mini tower chassis: Height 49 cm (19.3 inches) Width 22.1 cm (8.7 inches) Depth 45.2 cm (17.8 inches) Weight 16.8 kg (37.
Back to Contents Page System Setup: Dell Precision™ WorkStation 420 Systems User's Guide Using System Setup System Setup Options Back to Contents Page
Back to Contents Page Using System Setup: Dell Precision™ WorkStation 420 Systems User's Guide Overview Using the System Password Feature Entering System Setup Using the Setup Password Feature System Setup Screen Disabling a Forgotten Password System Setup Navigation Keys Overview Each time you turn on your computer system or press the reset button, the system scans the system configuration for changes. If the system detects any changes, it generates messages that identify them.
Fields next to the options contain settings or values. You can change those values that appear bright on the screen. Options or values that you cannot change (because they are determined or calculated by the computer) appear less bright. l Key functions — The line of boxes across the bottom of all screens lists keys and their functions within System Setup. System Setup Navigation Keys Table 1 lists the keys you use to view or change information on the System Setup screen and to exit the program. Table 1.
password have full use of the system. When System Password is set to Enabled, the computer system prompts you for the system password just after the system boots. To change an existing system password, you must either know the password or have access to the inside of the computer. If you assign and later forget a system password, you need your computer key to get inside the chassis, where you can change a jumper setting to disable the system password feature.
NOTE: If you have assigned a setup password, the system accepts your setup password as an alternate system password. If a wrong or incomplete system password is entered, the following message appears on the screen: ** Incorrect password. ** Enter password: If an incorrect or incomplete system password is entered again, the same message appears on the screen. The third and subsequent times an incorrect or incomplete system password is entered, the system displays the following message: ** Incorrect password.
If the two passwords are different, the setup password can be used as an alternate system password. However, the system password cannot be used in place of the setup password. After you verify the password, the Setup Password setting changes to Enabled. The next time you enter the System Setup program, the system prompts you for the setup password. A change to Setup Password becomes effective immediately (rebooting the system is not required).
9. Assign a new system password and/or setup password. 10. Reset the chassis intrusion detector.
Back to Contents Page Troubleshooting: Dell Precision™ WorkStation 420 Systems User's Guide Basic Checks External Components Messages and Codes Internal Components Software Checks Getting Help Diagnostics Back to Contents Page
