HP EliteDesk 800 G4 Workstation Edition User Manual download pdf (Page 95)

System does not power on and the LEDs on the front of the computer are not ashing.

Cause Solution

1. If equipped with a voltage selector, 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 5V_aux

light on the system board turns on.

3. Replace the system board.

Press and hold the power button for less than 4 seconds. If the

hard drive LED does not turn on white then:

1. Check that the unit is plugged into a working AC outlet.

2. Open the access panel and check that the power button

cable is properly connected to the system board.

3. Check that the power supply cables are properly connected

to the system board.

4. 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

assembly.

5. If the 5V_aux light on the system board is o, then replace

the power supply.

6. Replace the system board.

Solving general problems 87

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HP EliteDesk 800 G4 Workstation Edition User Manual Page 95