Compaq dx2818 Service Reference Guide: HP Compaq dx2810 and dx2818 Business PC - Page 154

Activity, Beeps, Possible Cause, Recommended Action, Red Power LED flashes

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Table C-1 Diagnostic Front Panel LEDs and Audible Codes (continued) Activity Beeps Possible Cause Recommended Action Green Power LED flashes every two seconds. None Computer in Suspend to RAM mode (some models only) or normal Suspend mode. None required. Press any key or move the mouse to wake the computer. CPU fan is weak (RPM < 2 1000) or not turning. A warning message is displayed along with a series of long beeps for five seconds, then the system shuts down. Processor thermal 1. protection activated: A fan may be blocked or not turning. 2. OR The heatsink/fan assembly is not properly attached to the processor. 3. Ensure that the computer air vents are not blocked and the processor cooling fan is running. Open hood, press power button, and see if the processor fan spins. If the processor fan is not spinning, make sure the fan's cable is plugged onto the system board header. Ensure the fan is fully/ properly seated and installed. If fan is plugged in and seated properly, but is not spinning, then replace processor fan. 4. Reseat processor heatsink and verify that the fan assembly is properly attached. 5. Contact an authorized reseller or service provider. Red Power LED flashes 5 five times, once every second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved. Pre-video memory error. CAUTION: To avoid damage to the DIMMs or the system board, you must unplug the computer power cord before attempting to reseat, install, or remove a DIMM module. 1. Reseat DIMMs. 2. Replace DIMMs one at a time to isolate the faulty module. 3. Replace third-party memory with HP memory. 4. Replace the system board. Red Power LED flashes 6 six times, once every second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved. Pre-video graphics error. For systems with a graphics card: 1. Reseat the graphics card. 2. Replace the graphics card. 3. Replace the system board. For systems with integrated graphics, replace the system board. 144 Appendix C Troubleshooting

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Activity
Beeps
Possible Cause
Recommended Action
Green Power LED
flashes every two
seconds.
None
Computer in
Suspend to RAM
mode (some models
only) or normal
Suspend mode.
None required. Press any key or move
the mouse to wake the computer.
CPU fan is weak (RPM <
1000) or not turning. A
warning message is
displayed along with a
series of long beeps for
five seconds, then the
system shuts down.
2
Processor thermal
protection activated:
A fan may be blocked
or not turning.
OR
The heatsink/fan
assembly is not
properly attached to
the processor.
1.
Ensure that the computer air vents
are not blocked and the processor
cooling fan is running.
2.
Open hood, press power button,
and see if the processor fan spins.
If the processor fan is not spinning,
make sure the fan's cable is
plugged onto the system board
header. Ensure the fan is fully/
properly seated and installed.
3.
If fan is plugged in and seated
properly, but is not spinning, then
replace processor fan.
4.
Reseat processor heatsink and
verify that the fan assembly is
properly attached.
5.
Contact an authorized reseller or
service provider.
Red Power LED flashes
five times, once every
second, followed by a
two second pause.
Beeps stop after fifth
iteration but LEDs
continue until problem is
solved.
5
Pre-video memory
error.
CAUTION:
To avoid damage to the
DIMMs or the system board, you must
unplug the computer power cord before
attempting to reseat, install, or remove
a DIMM module.
1.
Reseat DIMMs.
2.
Replace DIMMs one at a time to
isolate the faulty module.
3.
Replace third-party memory with
HP memory.
4.
Replace the system board.
Red Power LED flashes
six times, once every
second, followed by a
two second pause.
Beeps stop after fifth
iteration but LEDs
continue until problem is
solved.
6
Pre-video graphics
error.
For systems with a graphics card:
1.
Reseat the graphics card.
2.
Replace the graphics card.
3.
Replace the system board.
For systems with integrated graphics,
replace the system board.
Table C-1
Diagnostic Front Panel LEDs and Audible Codes (continued)
144
Appendix C
Troubleshooting