HP xw3400 - Workstation Technical Reference Manual page 135

Table D-1 Solving General Problems (continued)
System does not power on and the LEDs on the front of the workstation are not flashing.
Cause
ENWW
Solution
Check to see if the 5V_aux light on the system board is
4.
turned on. If it is turned on, then replace the power button
harness.
If the 5V_aux light on the system board is off, then replace
5.
the power supply.
Replace the system board.
6.
Solving general problems 125