TROUBLESHOOTING SCENARIOS AND SOLUTIONS 127
Chapter 5
Solving Power Supply Problems
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 the AC power cord from the workstation.
2 Disconnect all internal power supply cables.
3 Plug in the AC power cord.
If the green BIST LED 1 on the rear of the workstation is lit AND the fan is spinning, the power
supply is functional.
If the green BIST LED is not lit OR the fan is not spinning, replace the power supply.
Table 5-4
Solving 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 heatsink/fan assembly is
not properly attached to the
processor.
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.
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