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 the AC power.

•If the green BIST LED 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 5-24Power Supply Problems

Problem

Cause

Solution

 

 

 

Power supply shuts down

Power supply fault.

Replace the power supply.

intermittently.

 

 

Workstation powered off automatically and beeps and blinks RED two times

Processor thermal protection activated:

A fan might be blocked or not turning.

OR

The CPU heatsink 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 fan on the heatsink spins. If the fan is not spinning, be sure the heatsink cable is plugged into the system board header. Be sure the fan is properly seated or installed.

3.Replace the CPU heatsink.

4.Reseat the CPU heatsink and verify that the fan assembly is properly attached.

144 System Diagnostics and Troubleshooting