HP Workstation xw4100, Service And Technical Reference Manual

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hp workstation xw4100 service and technical reference guide 5–7
system diagnostics and troubleshooting
5.5.1 diagnostic light codes
chassis indicator lights
power LED and
sound activity
diagnosis and service action
none System does not power on
Press power button. If HDD LED = GREEN, then:
1. Verify voltage selected.
2. Remove expansion cards one-at-a-time until the 3.3 V_Aux light
on the system board illuminates.
3. Replace system board.
OR
Press power button. If HDD LED does not illuminate, then:
1. Verify workstation plugged into live AC outlet.
2. Verify power button harness connected to system board.
3. Verify that both power supply cables are properly connected to
the system board.
4. Verify that the 3.3 V_Aux light on the system board is illuminated.
If on, replace the power button harness.
5. If the3.3 V_Aux light on the system board is not illuminated,
replace the power supply.
6. Replace system board.
Solid GREEN
Power LED. Workstation on. No action required.
Solid YELLOW or
ORANGE. Workstation is in Standby. No action required.
GREEN Power LED
flashes 1 X each
2 seconds. Workstation in Suspended to RAM mode (select models) or normal
Suspend mode. No action required.
none Workstation in Suspend to Disk or “Hibernate” mode. No action
required.
Solid RED LED. CPU not installed:
1. Install CPU.
2. Reseat CPU.
Blinks RED 2 X, once
per second, then
2 second pause. Thermal Shutdown:
1. Ensure the workstation air vents are not blocked and cooling fan
is running.
2. Open hood, press power button, and see if processor fan spins. If
not spinning, ensure fan cable is plugged into the system board.
ensure fan is fully/properly seated.
3. If fan is plugged in and seated but not spinning, then replace
processor fan.
4. Reseat CPU heatsink and verify fan assembly properly attached.