HP Z228 Maintenance And Service Manual page 77

Activity
The BIOS option you select controls the blue LED function during these suspend modes.
*
Possible cause
Press and hold the power button for less than four seconds. If the
hard drive LED does not turn on green then:
1. Check that unit is plugged into a working AC outlet.
2. Open the access panel and check that the power button harness
is properly connected to the system board.
3. Check that all power supply cables are properly connected to
the system board.
4. Check the power supply functionality.
a.
b.
c.
Recommended action
Disconnect the AC power.
Unplug cables connected to system board.
Plug in AC power.
●
If the power supply fan spins, the power supply is
good; replace the system board.
●
If the power supply fan does not spin or the LED does
not illuminate, replace the power supply.
Diagnostic codes and errors 67