HP Z220 F1J90UAABA manual Diagnostic codes and errors, Diagnostic LED and audible beep codes

Diagnostic codes and errors

This section presents information about diagnostic LED codes, LED color definitions, and POST error messages to help you troubleshoot problems.

Diagnostic LED and audible (beep) codes

This section describes the front panel LED error and operation codes as well as the audible codes that might occur before or during the POST.

Table 4-8Diagnostic lights and audible codes

Activity	Possible cause	Recommended action
Blue Power LED* on. No	Computer on.
beeps.
Blue Power LED* blinks	Computer in Sleep mode
every two seconds.* No	(S3-Suspend to RAM).
beeps.	Select models only.
Blue Power LED* is off.*	Computer in Hibernate
No beeps.	mode (S4-Suspend to
	disk) or system is off
	(S5).	N/A
Blue Power LED* blinks	Computer in Sleep mode
three times*, once per	(S3-Suspend to RAM).
second.* No beeps.	Select models only.
Blue Power LED* blinks	Computer in Hibernate
four times*, once per	mode (S4-Suspend to
second.* No beeps.	disk).

*User-selectable. See The Computer Setup (F10) Utility menu on page 44 for details.

For the following LED activity and beeps, the beeps are heard through the chassis speaker. Blinks and beeps repeat for five cycles, after which, only the blinks continue to repeat.

Red Power LED blinks two times, once every second, followed by a two-second pause. Two beeps.

CPU thermal protection activated by either of the following methods:

●A fan might be blocked or not turning.

●The heatsink and fan assembly is not properly attached to the CPU.

CAUTION: Internal components might be powered even when the computer is off. To prevent damage, disconnect the computer power cord before you remove a component.

1.Ensure that the computer air vents are not blocked and the cooling fan is running.

2.Open the access panel, press power button, and verify that the CPU fan is spinning. If the CPU fan is not spinning, make sure the fan cable is plugged into the computer board header. Ensure the fan is fully and properly seated or installed.

3.If fan is plugged in and seated properly, but is not spinning, the problem might be in the CPU fan. Contact HP for assistance.

4.Verify that the fan assembly is properly attached. If problems persist, there might be a problem with the CPU heatsink. Contact HP for assistance.

Diagnostic codes and errors 149