Activity Possible cause Recommended action
System does not
power-on and LEDs
are not blinking. No
beeps.
System unable to
power on.
CAUTION: Internal components might be powered even
when the system 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 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 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
**
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.
Contact HP for assistance.
*
The BIOS option you select controls the blue LED function during these suspend modes.
**
Some workstation models do not have BIST LED functionality. For BIST information, see the Maintenance and Service
Guide of the workstation.
LED color definitions
The following table describes what each LED light on the workstation front panel signifies.
Table 11-9 LED color definitions
LED state LED color System status
Solid Blue System is on.
Flashing Blue System is in Standby.
Solid or
flashing
Red System has experienced an error. ( See POST
error messages on page 89.)
None No light System is in Hibernate, or is off.
Table 11-8 Diagnostic lights and audible codes (continued)
88 Chapter 11 Diagnostics and troubleshooting ENWW
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