Filter
Top Products
Diagnostic Front Panel LEDs and Audible Codes
Possibl
e Cause
Beeps
& LED
blink
Activity Recommended Action
System
unable
to power
on.
None System does
not power on
and LEDs are
not flashing.
Press and hold the power button for less than 4
seconds.
If the hard drive LED turns green, the power button
is working correctly. Then, Replace the system
board.
OR
If the hard drive LED does not turn on green
then:
1. Check that the unit is plugged into a working AC
outlet.
2. Check that both power supply cables are properly
connected
to the system board.
3. Check to see if the 5V_aux light on the system
board is turned on. If it is turned on, then replace
the power button
harness. If the problem persists, replace the system
board.
4. If the 5V_aux light on the system board is not
turned on, remove the expansion cards one at a
time until the 5V_aux light on the system board
turns on. It the problem persists, replace the power
adapter.
✎
* Replacing the system board should ONLY be the last resort.
* * Replacing the power supply should ONLY be the last resort.
Service Reference Guide www.hp.com 4-2