Led Color Definitions - HP Z400 Maintenance And Service Manual

Table 6-8 Diagnostic lights and audible codes (continued)
Activity
Red Power LED blinks nine
times, once every second,
followed by a two-second
pause. Nine beeps.
System does not power-on
and LEDs are not blinking.
No beeps.

LED color definitions

The following table describes what each LED light on the workstation front panel signifies.
Table 6-9 LED color definitions
LED state
Solid
ENWW
Possible cause
System powers on but does
not start.
System unable to power on.
LED color System status
Blue System is on.
Recommended action
1.
The system board might have a problem. Contact HP for assistance.
2.
The CPU might have a problem. Contact HP for assistance.
CAUTION: Internal components might be powered even when the
workstation is off. To prevent damage, disconnect the workstation power
cord before you remove a component.
To resolve the problem, choose one of the following options:
Press and hold the power button for less than 4 seconds. If the hard disk
drive LED turns green, then:
1.
Remove the expansion cards one at a time and try holding the
power button again for less than 4 seconds.
2.
The problem might be on the system board. Contact HP for
assistance.
Press and hold the power button for less than 4 seconds. If the hard disk
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.
(For computers with a BIST LED on the rear panel) Check the power
supply functionality:
a.
Disconnect the AC power.
b.
Disconnect ALL internal power supply cables.
c.
Plug in the AC power.
d.
Power on the computer.
If the power supply fan spins and the BIST LED lights, the
●
power supply is functional. The problem might be on the
system board. Contact HP for assistance.
If the power supply fan does not spin or the BIST LED
●
does not light, the problem might be in the power supply.
See Testing power supply on page 176
information.
Diagnostic codes and errors
for more
199