HP Compaq d330 DT Troubleshooting Manual page 26

Troubleshooting Without Diagnostics
Solving Power Supply Problems (Continued)
Problem
System does not power on
and LEDs are not flashing.
2–10
Cause
System unable to power
on.
www.hp.com
Solution
Press and hold the power button for
less than 4 seconds. If the hard drive
LED turns green, then:
1. Check that the voltage selector,
located on the rear of the power
supply, is set to the appropriate
voltage. Proper voltage setting
depends on your region.
2. Remove the expansion cards
one at a time until the 3.3
V_aux light on the system board
turns on.
3. Replace the system board.
OR
Press and hold the power button for
less than 4 seconds. If the hard drive
LED does not turn on green then:
1. Check that the unit is plugged
into a working AC outlet.
2. Open hood and check that the
power button harness is
properly connected to the
system board.
3. Check that both power supply
cables are properly connected
to the system board.
4. Check to see if the 3.3 V_aux
light on the system board is
turned on. If it is turned on, then
replace the power button
harness.
5. If the 3.3 V_aux light on the
system board is not turned on,
then replace the power supply.
6. Replace the system board.
Troubleshooting Guide