EC0-1815V2NAR ATX 单板 ATX Motherboard Version: C01
Copyright Notice Information offered in this manual is believed to be correct at the time of printing, and is subject to change without prior notice in order to improve reliability, design and function and does not represent a commitment on the part of the manufacturer. In no event will the manufacturer be liable for direct, indirect, special, incidental, or consequential damages arising out of improper installation and/or use, or inability to use the product or documentation.
Safety Instructions 1. Please read this manual carefully before using the product; 2. Leave the board or card in the antistatic bag until you are ready to use it; 3. Touch a grounded metal object (e.g. for 10 seconds) before removing the board or card from the anti-static bag; 4. Before installing or removing a board, wear the ESD gloves or ESD wrist strap; handle the board by its edges only; 5.
Contents Chapter 1 Product Introduction.....................................................................................1 Overview ..................................................................................................................1 Mechanical Dimensions, Weight and Environment .................................................1 Typical Consumption ...............................................................................................1 Microprocessor ................................
ATX Power Switch and Hard Disk Indicator Connector..........................................9 Power Indicator Connector.......................................................................................9 Loudspeaker Output Connector..............................................................................10 7pin SATA Connector.............................................................................................10 KB/MS Connector.................................................................
UEFI Overview......................................................................................................24 UEFI Parameter Setup............................................................................................24 Basic Function Setting for UEFI ............................................................................25 System Resource Managed by UEFI under X86 Platform .....................................41 Chapter 4 Installing the Drivers.............................................
Chapter 1 Product Introduction Chapter 1 Product Introduction Overview EC0-1815V2NAR is an ATX single board computer, developed based on Intel® Q77 chipset. It complies with Ivy Bridge/Sandy Bridge LGA1155 dual core/quad core processor; supports 1600/1333/1066MHz DDR3 memory up to 16GB; six SATA high speed connectors, supporting RAID0/1/5/10; various display connectors supporting triple display function; two gigabit LAN ports; six RS232 ports (two support RS232/485); four USB3.0 ports and four USB2.
Chapter 1 Product Introduction Memory: Kingston DDR3 1066 4GB*2 ; Operating System: Windows XP; +5V@0.69A；+5%/-3%； +3.3V@0.40A；+5%/-3%； +12V@0.32A；+5%/-3%； Microprocessor Intel® Core™ Ivy Bridge/Sandy Bridge CPU of LGA1155 package. Note: different CPUs may have different requirements for memory and functions of the motherboard.
Chapter 1 Product Introduction Network Function Provides two 10/100/1000Mbps LAN ports; LAN1 supports Wake-on-LAN, LAN booting and AMT8.0 functions. Audio Function Adopts HDA standard, supporting rear panel MIC-IN/LINE-IN/LINE-OUT (default), SPDIF (optional), 5.1 sound track (optional) or dual channel power amplifier function (optional, power consumption for single channel is 2W). Power Feature Adopts standard ATX power supply; the board supports the status of S0, S1, S4 and S5.
Chapter 1 Product Introduction On-board I/O Six serial ports: COM1/COM2 supports RS-232/RS-485 mode selection while COM3/COM4 supports Pin9 12V/5V/RI selection; Six SATA connectors (SATA1 and SATA2 support SATA3.0 standard) support hot swap function (Please set the function in BIOS) and RAID0, 1, 5 and 10; Four USB2.0 ports; the rear panel provides four USB3.0 ports (complying with USB2.
Chapter 2 Installation Chapter 2 Installation Product Outline H1 H6 SPK1 J6 J5 JP9 JP8 JP7 JP5 JP4 JP2 DP1 KM1 J2 J1 PCIE1 PCI1 PCI2 PCI3 GPIO1 J4 SATA1 FP3 SATA6 SATA4 H4 H3 DIMM1 JCC1 H5 SATA5 SATA3 SATA2 SYSFAN1 FP1 FP2 PWR2 J3 TPM COM6 PCIE2 H7 DVI1 VGA1 PCI4 JP6 COM3 COM4 COM5 DP2 AUDIO1 CPUFAN1 PWR1 COM2 JP3 COM1 H2 DIMM2 Unit: mm Warning! Please adopt appropriate screws and proper installation methods (including board allocation, CPU and heat sink installation
Chapter 2 Installation Locations of Connectors H1 H6 SPK1 J6 J5 JP9 JP8 JP7 JP5 JP4 JP2 DP1 KM1 J2 J1 PCIE1 PCI1 PCI2 PCI3 GPIO1 J4 SATA1 FP3 SATA6 SATA4 H4 SATA5 SATA3 -6- H3 DIMM1 JCC1 H5 SATA2 SYSFAN1 FP1 FP2 PWR2 J3 TPM COM6 PCIE2 H7 DVI1 VGA1 PCI4 JP6 COM3 COM4 COM5 DP2 AUDIO1 CPUFAN1 PWR1 COM2 JP3 COM1 H2 DIMM2 EC0-1815V2NAR
Chapter 2 Installation Structure EC0-1815 Function block diagram PCIE x16 Slot Socket H2 PCIe X16 Channel A DDR3 LGA 1155 95W/65W/45W 77W/55W/45W/35W 37.5 x 37.5mm FDI DMIX4 DIMM2 1066/1333/1600 PCIE x4 Slot PCIe X4 PCIE Giga LAN2 RJ45 LAN2 PCI Slot*4 PCI Bus PCIE Giga LAN1 RJ45 LAN1 SATA*6 Audio Jack Channel B DDR3 DIMM1 1066/1333/1600 USB3.0/USB2.0 *4 USB2.0*4 USB2.0*4 Amplifier 5.1 Surround PCH Sata *6 USB3.0*4 BGA942 TDP:6.1W 27 x 27mm 9.5 x 10.6 DieSize Thickness 2.
Chapter 2 Installation Jumper Setting 1. Clear/Keep CMOS Setting CMOS is powered by the button battery on board. Clearing CMOS will restore original settings (factory default). The steps are listed as follows: (1) Turn off the computer and unplug the power cable; (2) Instantly short circuit JCC1; (3) Turn on the computer; (4) Follow the prompt on screen to enter BIOS setup when booting the computer, load optimized defaults; (5) Save and exit. Please set as follows: JCC1 (Pitch: 2.54mm) 2.
Chapter 2 Installation Serial Port Signal Name Pin RS-232 COM1 ~ COM6 1 DCD# Data- 2 RXD Data+ 3 TXD NC 4 5 DTR# GND NC GND COM1/COM2 6 DSR# NC Pitch: 2.54mm 7 RTS# NC 8 CTS# NC 9 RI# NC 10 NA NA RS-485 COM1/COM2 Note: 1. The data transmission direction is controlled automatically under RS485 mode; 2. The pin definitions for Pin9 on COM3 and COM4 include RI#/5V/12V.
Chapter 2 Installation Loudspeaker Output Connector FP3 (Pitch: 2.54mm) Pin Signal Name 1 SPEAKER 2 NC 3 GND 4 +5V 7pin SATA Connector SATA1 ~ SATA6 Pin Signal Name 1 GND 2 TX+ 3 TX- 4 GND 5 RX- 6 RX+ 7 GND KB/MS Connector KM1 Pin Signal Name Pin Signal Name 1 KB_DATA 7 MS_DATA 2 NC 8 NC 3 GND 9 GND 4 +5V 10 +5V 5 KB_CLK 11 MS_CLK 6 NC 12 NC USB Port The board provides four USB 3.0 ports, brought out by rear panel; the other two USB 2.
Chapter 2 Installation Pin 1 2 3 4 5 6 7 8 9 J1(USB1/USB2) J2(USB3/USB4) Signal Name +5V USB_DataUSB_Data+ GND USB_SSRXUSB_SSRX+ GND USB_SSTXUSB_SSTX+ 2. USB2.0 Port: Pin Signal Name Pin Signal Name 1 +5V 2 +5V 3 USB1_Data- 4 USB2_Data- 5 USB1_Data+ 6 USB2_Data+ 7 GND 8 GND 9 NA 10 GND J3(USB5/USB6) J4(USB7/USB8) (Pitch: 2.54mm) Audio Connector The board provides AUDIO JACK function (Default), 5.1 track output, SPDIF and dual channel power amplify output (optional).
Chapter 2 Installation J6 (Pitch: 2.54mm) SPK1 (Pitch: 2.54mm) Pin Signal Name 1 +5V 2 NC 3 SPDIF_OUT 4 GND Pin Signal Name 1 SPEAKOUT_LEFT+ 2 SPEAKOUT_LEFT- 3 SPEAKOUT_RIGHT- 4 SPEAKOUT_RIGHT+ Note Positive Pole of the Left Loudspeaker Negative Pole of the Left Loudspeaker (Ungrounded) Negative Pole of the Right Loudspeaker (Ungrounded) Positive Pole of the Right Loudspeaker GPIO Connector GPIO1 (Pitch: 2.
Chapter 2 Installation TPM Connector The board provides one 2x10 TPM pin header (PIN4 is NA, Pitch: 2.54mm). TPM Pin Signal Name Pin Signal Name 1 CLOCK 2 GND 3 LPC_FRAME- 4 NA 5 PLT_RST- 6 VCC5 7 AD3 8 AD2 9 VCC3.3 10 AD1 11 AD0 12 GND 13 SMB_CLK 14 SMB_DATA 15 VCC3SB 16 SERIRQ 17 GND 18 CLKRUN 19 SUS_SATA- 20 DRQ- LAN Port The board provides two 10/100/1000Mbps LAN ports, J1 (LAN1) and J2 (LAN2). LAN1 supports Wake-on-LAN, and AMT8.0 functions.
Chapter 2 Installation 2x8 Pin VGA Connector VGA1 Pin Signal Name Pin 1 Red 2 Signal Name GND 3 NC 4 Green 5 GND 6 DDCDATA 7 Blue 8 GND 9 HSYNC 10 NC 11 NC 12 VSYNC 13 GND 14 GND 15 DDCCLK 16 Shield_gnd Signal Name LANE0P LANE0N GND LANE2P LANE2N GND GND AUXCHP AUXCHN RETURN Pin 2 4 6 8 10 12 14 16 18 20 Signal Name GND LANE1P LANE1N GND LANE3P LANE3N GND GND HPD DP_PWR Display Port DP1/DP2 Pin 1 3 5 7 9 11 13 15 17 19 DVI Connector DVI1 (Pitch: 2.
Chapter 2 Installation Motherboard Power Supply Connector 1. 4pin CPU Power Connector (Pitch: 4.2mm) PWR1 Pin Signal Name 1 GND 2 GND 3 +12V 4 +12V 2. 24pin ATX Power Connector (Pitch: 4.2mm) Pin PWR2 Signal Name Pin Signal Name 1 +3.3V 13 +3.3V 2 +3.3V 14 -12V 3 GND 15 GND 4 +5V 16 PS_ON# 5 GND 17 GND 6 +5V 18 GND 7 GND 19 GND 8 PWROK 20 -5V 9 +5VSB 21 +5V 10 11 +12V +12V 22 23 +5V +5V 12 +3.
Chapter 2 Installation 4-pin CPU Fan Connector Pin Signal Name 1 GND 2 +12V CPUFAN1 3 FAN_IO Pitch: 2.54mm 4 FAN_PWM Note: FAN_I: fan speed impulse output; FAN_PWM: fan speed PWM control. Installing the CPU Please install the CPU as follows (refer to the figure below): Align the notches on the CPU with tabs on the CPU socket and put the CPU into the socket. When the CPU is fully seated in the socket, close the upper cover on CPU socket and then lock the CPU into place by the clip.
Chapter 2 Installation Assemble the bracket of the cooling fin with the fixing holes on the rear of the CPU card.
Chapter 2 Installation PCI Connector The board provides four standard PCI connectors, PCI1 ~ PCI4 (Version 2.3); the pin definitions are as follows: Pin Signal Name Pin Signal Name Pin Signal Name Pin Signal Name A1 TRST# A31 PCI_AD18 B1 -12V B31 +3.3V A2 +12V A32 PCI_AD16 B2 TCK B32 PCI_AD17 A3 TMS A33 +3.3V B3 GND B33 PCI_C/BE#2 A4 TDI A34 PCI_FRAME# B4 TDO B34 GND A5 +5V A35 GND B5 +5V B35 PCI_IRDY# A6 INTA# A36 PCI_TRDY# B6 +5V B36 +3.
Chapter 2 Installation PCIe x16 Connector The board provides one PCIE x16 slot (PCIE1); the pin definitions are as follows: Pin Signal Name Pin Signal Name Pin Signal Name Pin Signal Name A1 PRSNT1# A2 +12V B1 +12V B2 +12V A3 +12V A4 GND B3 RSVD B4 GND A5 TCK A6 TDI B5 SMCLK B6 SMDATA A7 TDO A8 TMS B7 GND B8 +3.3V A9 +3.3V A10 +3.3V B9 TRST# B10 3.
Chapter 2 Installation A63 GND A64 PERp11 B63 PETn11 B64 GND A65 PERn11 A66 GND B65 GND B66 PETp12 A67 GND A68 PERp12 B67 PETn12 B68 GND A69 PERn12 A70 GND B69 GND B70 PETp13 A71 GND A72 PERp13 B71 PETn13 B72 GND A73 PERn13 A74 GND B73 GND B74 PETp14 A75 GND A76 PERp14 B75 PETn14 B76 GND A77 PERn14 A78 GND B77 GND B78 PETp15 A79 GND A80 PERp15 B79 PETn15 B80 GND A81 PERn15 A82 GND B81 PRSNT2#C B82 RSVD PCIe x4 Connector The boar
Chapter 2 Installation A37 GND A38 GND B37 NC B38 NC A39 NC A40 NC B39 GND B40 GND A41 GND A42 GND B41 NC B42 NC A43 NC A44 NC B43 GND B44 GND A45 GND A46 GND B45 NC B46 NC A47 NC A48 NC B47 GND B48 NC A49 GND A50 NC B49 GND B50 NC A51 GND A52 NC B51 NC B52 GND A53 NC A54 GND B53 GND B54 NC A55 GND A56 NC B55 NC B56 GND A57 NC A58 GND B57 GND B58 NC A59 GND A60 NC B59 NC B60 GND A61 NC A62 GND B61 GND B62
Chapter 2 Installation SATA Data Cable SATA Power Cable Please carry out hot plugging as follows. Improper operation may destroy the hard disk or result in data loss. Hot Plug Step 1: Please plug the 1 x 4 pin SATA power connector (white) into the power adapter. Step 2: Please connect the SATA data cable to the SATA connector on board. Step 3: Please connect the 15-pin SATA power connector (black) to the SATA hard disk.
Chapter 2 Installation Step 4: Please connect the SATA data cable to the SATA hard disk. Hot Unplug Step 1: Uninstall the hard disk from the device manager. Step 2: Unplug the data cable from the SATA hard disk. Step 3: Unplug the SATA 15-pin power connector (black) from the SATA hard disk.
Chapter 3 BIOS Setup Chapter 3 BIOS Setup UEFI Overview UEFI (Unified Extensible Firmware Interface) is the latest computer firmware to replace traditional BIOS. UEFI is solidified in the flash memory on the CPU board.
Chapter 3 BIOS Setup Basic Function Setting for UEFI After starting SETUP program, the main interface of Aptio Setup Utility - Copyright (C) 2011 American Megatrends, Inc. will appear: Aptio Setup Utility – Copyright (C) 2011 American Megatrends, Inc. Copyright (C) Main Advanced Chipset Boot Security Set the Date. Use ‘Tab’ to switch BIOS Information Project Name BIOS Name BIOS Version Build Date and Time Save & Exit EC0-1815V2NAR between Date elements.
Chapter 3 BIOS Setup Choose this option and set the current time by < + > / < - >, which is displayed in format of hour/minute/second. Reasonable range for each option is: Hour (00-23), Minute (00-59), Second (00-59). Advanced Aptio Setup Utility – Copyright (C) 2011 American Megatrends, Inc.
Chapter 3 BIOS Setup TPM SUPPORT Enable TPM function. CPU Configuration Aptio Setup Utility – Copyright (C) 2011 American Megatrends, Inc. Advanced CPU Configuration Genuine Intel® CPU @ 2.
Chapter 3 BIOS Setup SATA Configuration Aptio Setup Utility – Copyright (C) 2011 American Megatrends, Inc. Advanced SATA Controller(s) SATA Mode Selection [Enabled] [IDE] Serial ATA Port 1 Serial ATA Port 2 Serial ATA Port 3 Serial ATA Port 4 Serial ATA Port 5 Serial ATA Port 6 Empty Empty Empty Empty Empty Empty →←: Select Screen ↑↓: Select Item Enter: Select +/-: Change Opt F1: General Help F2: Previous Values F3: Optimized Defaults F4: Save ESC: Exit Version 2.14.1219.
Chapter 3 BIOS Setup Intel TXT(LT) Configuration Aptio Setup Utility – Copyright (C) 2011 American Megatrends, Inc. Advanced Intel Trusted Execution Technology Configuration Intel TXT support only can be enabled/disabled if SMX is enabled. VT and VT-d support must also be enabled prior to TXT.
Chapter 3 BIOS Setup Intel AMT Control switch for AMT function. Un-configure ME Switch for reconfiguring ME without password. When this option is Enabled, it will load ME default value without requiring the password during POST period. Disable ME Enable ME function control switch. USB Configuration Aptio Setup Utility – Copyright (C) 2011 American Megatrends, Inc.
Chapter 3 BIOS Setup Super IO Configuration Aptio Setup Utility – Copyright (C) 2011 American Megatrends, Inc. Advanced Super IO Configuration →←: Select Screen ↑↓: Select Item Enter: Select +/-: Change Opt F1: General Help F2: Previous Values F3: Optimized Defaults F4: Save ESC: Exit Serial Port 1 Configuration Serial Port 2 Configuration Serial Port 3 Configuration Serial Port 4 Configuration Serial Port 5 Configuration Serial Port 6 Configuration Version 2.14.1219.
Chapter 3 BIOS Setup H/W Monitor Aptio Setup Utility – Copyright (C) 2011 American Megatrends, Inc. Advanced PC Health Status System Temperature CPU Temperature SYSFAN1 CPUFAN1 Vcore V3.3 V5.0 V12.0 VBAT : +29 C : +30 C : 3068 RPM : 2086 RPM : +0.992 V : +3.296 V : +5.007 V : +12.091 V : +3.232 V →←: Select Screen ↑↓: Select Item Enter: Select +/-: Change Opt F1: General Help F2: Previous Values F3: Optimized Defaults F4: Save ESC: Exit Version 2.14.1219. Copyright (C) 2011,American Megatrends, Inc.
Chapter 3 BIOS Setup CPU PPM Configuration Aptio Setup Utility – Copyright (C) 2011 American Megatrends, Inc. Advanced CPU PPM Configuration EIST Turbo Mode CPU C3 Report CPU C6 Report CPU C7 Report [Enabled] [Enabled] [Enabled] [Enabled] [Enabled] →←: Select Screen ↑↓: Select Item Enter: Select +/-: Change Opt F1: General Help F2: Previous Values F3: Optimized Defaults F4: Save ESC: Exit Version 2.14.1219. Copyright (C) 2011,American Megatrends, Inc. Display the information relevant to CPU.
Chapter 3 BIOS Setup PCH-IO Configuration Aptio Setup Utility – Copyright (C) 2011 American Megatrends, Inc.
Chapter 3 BIOS Setup Enable the control switch of audio codec port DP1. Audio codec Port DP2 Enable the control switch of audio codec port DP2. PCIe Speed Speed control switch for PCIE2. USB Configuration Aptio Setup Utility – Copyright (C) 2011 American Megatrends, Inc.
Chapter 3 BIOS Setup General control switch for the USB Port. USB 1~8 Disable * Switches for USB Port 1 ~ 8. System Agent (SA) Configuration Aptio Setup Utility – Copyright (C) 2011 American Megatrends, Inc. Chipset VT-d Capability Supported VT-d PEG0 – Gen X De-emphasis Control [Enabled] [Auto] [-3.
Chapter 3 BIOS Setup Graphics Configuration Aptio Setup Utility – Copyright (C) 2011 American Megatrends, Inc. Advanced Graphics Configuration Primary IGFX Boot Display [CRT] Secondary IGFX Boot Display [Disabled] Primary Display [Auto] DVMT Pre-Allocated [64M] DVMT Total Gfx Mem [256M] →←: Select Screen ↑↓: Select Item Enter: Select +/-: Change Opt F1: General Help F2: Previous Values F3: Optimized Defaults F4: Save ESC: Exit Version 2.14.1219. Copyright (C) 2011,American Megatrends, Inc.
Chapter 3 BIOS Setup Memory Configuration Aptio Setup Utility – Copyright (C) 2011 American Megatrends, Inc.
Chapter 3 BIOS Setup Boot Aptio Setup Utility – Copyright (C) 2011 American Megatrends, Inc. Main Advanced Chipset Boot Boot Configuration Quiet Boot Security [Disabled] Boot Option Priorities Boot Option #1 Boot Option #2 [Netac] [UEFI: Netac] Hard Drive BBS Priorities Save & Exit →←: Select Screen ↑↓: Select Item Enter: Select +/-: Change Opt F1: General Help F2: Previous Values F3: Optimized Defaults F4: Save ESC: Exit Version 2.14.1219. Copyright (C) 2011,American Megatrends, Inc.
Chapter 3 BIOS Setup Security Aptio Setup Utility – Copyright (C) 2011 American Megatrends, Inc. Main Advanced Chipset Boot Security Save & Exit Password Description If ONLY the Administrator's password is set, then this only limits access to Setup and is only asked for when entering Setup. If ONLY the User's password is set, then this is a power on password and must be entered to boot or enter Setup. In Setup the User will have Administrator rights.
Chapter 3 BIOS Setup Save Changes and Reset The option is used to save changes and reset. Discard Changes and Reset The option is used to discard changes and reset. Boot Override This option is used to select the boot device. System Resource Managed by UEFI under X86 Platform We define three kinds of system resources here: I/O port address, IRQ interrupt number and DMA number.
Chapter 3 BIOS Setup IO Port Address Only 16 IO address lines are designed for X86, from 0 ~ 0FFFFh; there is 64K for the system I/O address space. In traditional ISA connector, only the foregoing 1024 (0000 ~ 03FFh) are adopted while the ports above 0400h are adopted by PCI and EISA connectors. Each peripheral will occupy portion of the space. The table below shows parts of the I/O connectors used in X86 platform.
Chapter 3 BIOS Setup 062h – 063h Motherboard Resource 063h Motherboard Resource 064h Standard 101/102 Key or Microsoft Natural PS/2 Keyboard 065h Motherboard Resource 065h - 06Fh Motherboard Resource 067h Motherboard Resource 070h Motherboard Resource 070h - 077h Real Time Clock, NMI 072h – 07Fh Motherboard Resource 080h Motherboard Resource 080h Motherboard Resource 081h - 091h DMA Controller 084h - 086h Motherboard Resource 088h Motherboard Resource 08Ch – 08Eh Motherboard Res
Chapter 3 BIOS Setup 0B8h – 0B9h Programmable Interrupt Controller 0BCh – 0BDh Programmable Interrupt Controller 0C0h – 0DFh DMA Controller 0E0h - 0EFh Motherboard Resource 0F0h - 0FFh Numeric data processor 210h - 217h COM3 218h - 21Fh COM 4 220h - 227h COM 5 228h - 22Fh COM 6 274h – 277h ISAPNP Read Data Port 279h ISAPNP Read Data Port 2F8h - 2FFh COM 2 3B0h – 3BBh Intel(R) HD Graphics 3C0h – 3DFh Intel(R) HD Graphics 3F8h - 3FFh COM1 400h - 453h Motherboard Resource 454h
Chapter 3 BIOS Setup IRQ Assignment Table There are 15 interrupt sources of the system. Some are occupied by the system devices. Only the ones that are not occupied can be assigned to other devices. ISA device requests exclusive use of its interrupt. Only the plug and play ISA devices can be assigned by the UEFI or the OS. And several PCI devices share one interrupt, which is assigned by UEFI or OS.
Chapter 4 Installing the Drivers Chapter 4 Installing the Drivers Regarding the driver program of this product, please refer to the enclosed CD.
Appendix Appendix BPI Overview EVOC BPI (BIOS Programming Interface) is a cross-platform, easy-to-maintain software interface specification, which supports access to hardware under the Protected Mode of the operating system.
Appendix with complicated test and debug process and software of different platforms; however, the software developed by BPI only requires one set of the maintenance software. 5、 Low Cost Developing the applications by BPI will not result in additional hardware and software cost, but it will reduce the development difficulty, development cycle and time-to-market for the system integrator. Troubleshooting and Solutions NO.
Appendix and cannot enter system; even when the former memory is re-installed, the system cannot be booted as well. 5 The system cannot be booted after replacing a CD-ROM. 6 No PCI card can be detected after entering the system.
Appendix 7 - 50 - No peripheral devices can be detected. Analysis: devices are not connected; no drivers are loaded; devices are broken. Solution: check whether the cable between the device and the motherboard is normal; if it is normal, replace it with a new cable to make sure the connection is OK. Re-install the device driver and check whether it can be recognized; check whether the device is normal; if the device is normal, then check whether the device is compatible with the motherboard.
