Troubleshooting Guide

Troubleshooting Guide www.hp.com 11
Troubleshooting
Diagnostic Front Panel LEDs
Activity Possible Cause Recommended Action
Green Power LED On. Computer on. No action required.
Green Power LED
flashes every two
seconds.
Computer in Suspend to
RAM mode (some
models only) or normal
Suspend mode.
Press any key or move the mouse to
wake the computer.
Green Power LED
flashes every four
seconds.
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 or 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.
Green Power LED
flashes five times, once
every second, followed
by a two second
pause.
Pre-video memory error. 1. Reseat DIMMs. Power on the
system.
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.