Led Color Definitions - HP Z400 - Workstation Maintenance And Service Manual

Table 6-8 Diagnostic lights and audible codes (continued)
Activity
System does not power-on
and LEDs are not blinking.
No beeps.
The BIOS option you select controls the blue LED function during these suspend modes.
*
** Some workstation models do not have BIST LED functionality.

LED color definitions

The following table describes what each LED light on the workstation front panel signifies.
Table 6-9
LED state
Solid
Flashing
Solid or flashing
None
168 Chapter 6 Diagnostics and troubleshooting
Possible cause
System unable to power on.
LED color definitions
LED color System status
Blue System is on.
Blue System is in Standby.
Red System has experienced an error. (See
messages on page
No light System is in Hibernate, or is off.
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. Check the power supply functionality
a. Disconnect the AC power.
b. Disconnect all internal power supply cables.
c. Plug in the AC power.
If the power supply fan spins and the BIST
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
light, the problem might be in the power supply. Contact HP for
assistance.
POST error
169.)
Recommended action
** LED lights, the power
** LED does not
ENWW