HP FL939UT FL939UT#ABA manual 9LED color definitions, LED state LED color System status

Table 6-8Diagnostic lights and audible codes (continued)

Activity	Possible cause	Recommended action
System does not power-on	System unable to power on. CAUTION: Internal components might be powered even when the
and LEDs are not blinking.	workstation is off. To prevent damage, disconnect the workstation power
No beeps.	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. Remove power supply from system chassis. (See Removing the power supply on page 80 for details.)

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 6-9LED 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 196.)
None	No light	System is in Hibernate, or is off.

ENWW Diagnostic codes and errors 195