TROUBLESHOOTING SCENARIOS AND SOLUTIONS 115
Chapter 5
Solving Power Supply Problems
Testing Power Supply
Before replacing the power supply, use the Built-In Self-Test (BIST) feature to learn if the power supply
still works.
To test the power supply:
1 Disconnect all internal power supply cables.
2 Plug in AC power.
a If the green BIST LED 1 on the rear of the workstation is lit AND the fan is spinning, the power
supply is functional.
b If the green BIST LED is not lit OR the fan is not spinning, replace the power supply.
Table 5-4 Power Supply Problems
Problem Cause Solution
Power supply shuts down
intermittently.
Power supply fault. Replace the power supply.
Workstation powered off
automatically and the Power LED
flashes Red two times, once every
second, followed by a two-second
pause.
Processor thermal protection
activated:
A fan might be blocked or not
turning.
OR
The CPU heatsink fan
assembly is not properly
attached to the processor.
1 Be sure that the workstation air vents are not blocked
and the cooling fan is running.
2 Open the access panel, press the power button, and
see if the processor fan spins. If the processor fan is
not spinning, be sure the fan’s cable is plugged onto
the system board header. Be sure the fan is fully/
properly seated or installed.
3 Replace the processor fan.
4 Reseat CPU heatsink and verify that the fan assembly
is properly attached.
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