HP Z220 SFF, Z220 CMT, Z420, Z620, and Z820 Workstations Maintenance and Service Guide

Problem Cause Possible Solution
c. Reconnect AC power and power on the
computer.
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:
a. Verify that the computer 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 unit (PSU) cables are
connected to the system board.
3. Verify power supply unit PSU functionality:
a. Disconnect the AC power.
b. HP Z820 Workstation only—Remove PSU. All
other workstations, unplug cables connected to
the system board.
c. Reconnect AC power
●
If the PSU fan spins and the BIST LED
illuminates, the PSU is good; replace the
system board.
●
If the PSU fan does not spin or the LED
does not illuminate, replace the PSU.
Troubleshooting scenarios and solutions 123