Diagnostic Codes And Errors; Diagnostic Led And Audible (Beep) Codes - HP Z1 Maintenance And Service Manual

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 4-7 Diagnostic lights and audible codes
Activity
Blue Power LED on. No
beeps.
Blue Power LED blinks
every two seconds. No
beeps.
Blue Power LED is off. No
beeps.
Blue Power LED blinks
three times*, once per
second. No beeps.
Blue Power LED blinks
four times*, once per
second. No beeps.
*User-selectable. See
menu on page 15
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.
Red Power LED blinks
three times, once every
second, followed by a
Possible cause
Computer on.
Computer in Sleep
mode (S3-Suspend to
RAM). Select models
only.
Computer in Hibernate
mode (S4-Suspend to
disk) or system is off
(S5).
Computer in Sleep
mode (S3-Suspend to
RAM). Select models
only.
Computer in Hibernate
mode (S4-Suspend to
disk).
Computer Setup (F10) Utility
for details.
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.
CPU not installed (not
an indicator of bad
CPU).
Recommended action
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.
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.
N/A
Diagnostic codes and errors 81