Service and Maintain
HP 500B, MT 635950-001 page 2
System Board
Diagnostic Beep Codes
The Power-On Self-Test (POST) is a series of diagnostic tests that runs automatically when the
computer is powered on. If the POST detects an error, this causes an audible beep code to sound.
The POST beep codes are not necessarily accompanied by an associated, visible error code or
text message.
The following table shows the POST beep codes, their meanings, and the recommended actions
for solving the problem.
Standard and Optional Boards
System boards with thermal grease, alcohol pad, and CPU socket cover
1 System board 616409-001
Memory modules
2 2 GB, PC3-10600
629026-001
576110-001
2 1 GB, PC3-10600
629025-001
576109-001
Other boards
LSI 56K modem, PCIe 490689-001
HP Wireless 802.11b/g/n WLAN card 538048-001
802.11b/g/n WLAN card, for use in ROW 498307-001
ATI Radeon HD4350 (RV710) PCIe x16 graphics card, 512 MB 586750-001
ATI Radeon HD5450 PCIe graphics card, 1 GB 601155-001
ATI Radeon HD5450 PCIe graphics card, 512 MB 617079-001
GeForce G315, PCIe graphics card, 1 GB 619934-001
GeForce G320, PCIe graphics card, 1 GB 615793-001
GeForce G210, PCIe graphics card, 512 MB 586382-001
Intel Gigabit NIC, includes bracket 490367-001
HP FireWire IEEE 1394 PCI card, FH 515182-001
1394 PCI card, 3 port, FH 441448-001
Antenna, dual band, 802.11 583345-001
Intel Celeron Processors with alcohol pad and thermal grease:
E3400, 1-MB cache, 2.60 GHz 602071-001
Intel Core2 Duo Processors with alcohol pad and thermal grease:
E7600, 3-MB cache, 3.06 GHz 573954-001
E7500, 3-MB cache, 2.93 GHz 531988-001
E6800, 2-MB cache, 3.33 GHz 631758-001
E6700, 2-MB cache, 3.20 GHz 418950-001
E6600, 2-MB cache, 3.06 GHz 602070-001
E6500, 2-MB cache, 2.93 GHz 586748-001
E5700, 2-MB cache, 3.00 GHz 631759-001
E5500, 2-MB cache, 2.80 GHz 613035-001
E5400, 2-MB cache, 2.70 GHz 586743-001
System Board Connectors and Jumpers (position of some untitled
components may vary in location)
PROCESSOR
Processor socket
PCI2
PCI slot
CPU FAN
Fan connector
PCIE1X1
PCIe x1 slot
DIMM1-2
Memory slots
PCIE1X
PCIe x1 slot
AT X_ P OW ER
24-pin main power connector
PCIE16X
PCIe x16 slot
BATTERY
RTC battery socket
AUDIO
External in/out connectors
SATA0-3
Drive connectors
NIC_USB
Stacked network/USB connec-
tors
F_PANEL
Front I/O connector
USB
Stacked USB connectors
P154
Front I/O connector
AT X_ 1 2V
4-pin CPU power connector
P152
Front I/O connector
VGA
Monitor connector
F_AUDIO
Front audio connector
Diagnostic Beep Codes
Beeps Diagnosis Recommended Action
1 short, 1 long Bad memory or memory configura-
tion error
Check that the memory modules
have been installed correctly and
that proper modules are used.
2 short, 1 long No graphics card installed or graph-
ics card initialization failed.
For systems with a graphics card:
1. Reseat the graphics card. Power
on the system.
2. Replace the graphics card.
3. Replace the system board.
For systems with integrated graph-
ics, replace the system board.
3 short, 1 long CPU configuration error or invalid
CPU detected before graphics card
initialized.
For systems with a graphics card:
1. Reseat the graphics card. Power
on the system.
2. Replace the graphics card.
3. Replace the system board.
For systems with integrated graph-
ics, replace the system board.
1 short, short
pause
No legacy floppy drive or optical
drive found
1. Check cable connections.
2. Run the Setup utility and ensure
the device port is enabled.
2 short, long
sec pause
No floppy diskette or CD found 1. Check the type of drive you are
using and use the correct media
type.
2. Replace the diskette or CD with a
new one.
3 short, long
sec pause
Flashing not ready (missing utility
or BIOS image file, etc.)
Upgrade the BIOS to proper ver-
sion.
4 short, long
sec pause
Flashing operation has failed
(checksum error, corrupted image,
etc.)
1. Verify the correct ROM.
2. Flash the ROM if needed.
3. If an expansion board was
recently added, remove it to see if
the problem remains.
4. Clear CMOS.
5. If the message disappears, there
may be a problem with the
expansion card.
6. Replace the system board.
5 short, long
sec pause
BIOS recovery was successful No action required.