Solving Power Supply Problems; Testing Power Supply - HP Xw4400 - Workstation - 2 GB RAM Reference Manual

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. 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 (illustrated below) on the rear of the workstation is illuminated and the
fan is spinning, the power supply is functional.
●
If the green BIST LED (illustrated below) is not illuminated or the fan is not spinning, replace
the power supply.
Figure 5-1
Table 5-4 Power supply problems
Problem
Power supply shuts down
intermittently.
110 Chapter 5 System diagnostics and troubleshooting
Testing power supply with BIST LED
Power supply fault.
Cause
Replace the power supply.
Solution
ENWW