Solving Power Supply Problems - HP xw4100 Service And Technical Reference Manual

system diagnostics and troubleshooting

5.6.2 solving power supply problems

solving power supply problems
problem
Power supply shuts down
intermittently.
Workstation powered off
automatically and the
Power LED flashes Red two
times, once every second,
followed by a two second
pause.
Power LED flashes Red,
once every two seconds.
5–22
cause
Voltage selector switch
on rear of workstation
chassis not switched to
correct line voltage.
Power supply fault.
Processor thermal
protection activated:
A fan may be blocked
or not turning.
OR
The heatsink/fan
assembly is not properly
attached to the
processor.
Power failure (power
supply is overloaded).
hp workstation xw4100 service and technical reference guide
solution
Select the proper AC voltage.
Replace the power supply.
1. Ensure that the workstation air
vents are not blocked and the
cooling fan is running.
2. Open hood, press the 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. Replace the processor fan.
4. Reseat processor heatsink and
verify that the fan assembly is
properly attached.
1. Check that the voltage selector, is
set to the appropriate voltage.
2. Open the hood and ensure the
4-wire power supply cable is
seated into the connector on the
system board.
3. Check if a device is causing the
problem by removing ALL attached
devices). Power on the system.
If the system enters the POST,
then power off and replace one
device at a time and repeat this
procedure until failure occurs.
Replace the device causing the
failure. Continue adding devices
one at a time to ensure all devices
are functioning properly.
4. Replace the power supply.
5. Replace the system board.