HP Z800 Sp632up SP632UPABA Solving power supply problems, Testing power supply, Problem Cause

Table 6-1Minor problems (continued)

Problem Cause Possible Solution

a. Disconnect AC power to the workstation.

b. Remove a device.

c. Reconnect AC power and power on the workstation.

2. Repeat this process until the faulty device is identified. Remove the graphics card last. Replace the faulty device.

3. If no faulty device is found, replace the system board.

OR

1. Press and hold the power button for less than four seconds. If the hard drive LED does not illuminate, then perform the following tasks:

a. Verify that the workstation is plugged into a working AC outlet.

b. Verify that the power button harness is connected

to the inline front panel I/O device assembly connector.

2. Verify that the power supply cables are connected to the system board.

3. Verify power supply functionality:

a. Disconnect the AC power.

b. Remove the power supply.

c. Reconnect the AC power.

● If the power supply fan spins and the BIST LED illuminates (see Testing power supply on page 174), the power supply is good.

Replace the system board.

● If the power supply fan does not spin or the LED does not illuminate (see Testing power supply on page 174), replace the power supply.

Solving power supply problems

This section presents power supply troubleshooting scenarios.

Testing power supply

Before replacing the power supply, use the Built-In Self-Test (BIST) feature to learn if the power supply still works.

174 Chapter 6 Diagnostics and troubleshooting ENWW