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HP xw4400, xw4550, xw4600, xw6400, xw8400, and xw9400 Workstations - Solving Power Supply Issues


Testing the 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, complete the following steps:

  1. Unplug the AC power.

  2. Disconnect all internal power supply cables from the system board.

  3. Plug in AC power.
    • If the green BIST LED on the rear of the workstation is illuminated, and the fan is spinning, the power supply is functional.
    • If the green BIST LED is not illuminated, or the fan is not spinning, replace the power supply.

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