HP Z1 G2 Maintenance And Service Guide

Diagnostic codes and errors
This section presents information about diagnostic LED codes, LED color denitions, 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.
Activity Possible cause Recommended action
Power LED is blue. No
beeps.
Computer on.
N/A
Power LED ashed blue
every two seconds. No
beeps.
Computer in Sleep mode
(S3-Suspend to RAM).
Select models only.
Power LED is o. No beeps. Computer in Hibernate
mode (S4-Suspend to
disk) or system is o (S5).
Power LED ashes blue
three times*, once per
second. No beeps.
Computer in Sleep mode
(S3-Suspend to RAM).
Select models only.
Power LED ashes blue four
times*, once per second. No
beeps.
Computer in Hibernate
mode (S4-Suspend to
disk).
*User-selectable. See Computer Setup (F10) Utility menu
on page 15 for details.
For the following LED activity and beeps, the beeps are heard through the chassis speaker. Flashes and beeps repeat for ve
cycles. Then, only the ashes repeat.
Power LED ashes red 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 o. To prevent damage, disconnect the computer power
cord before you remove a component.
1. Verify 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, verify that the
fan cable is plugged into the computer board header. Verify that
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.
Power LED ashes red three
times, once every second,
followed by a two-second
pause. Three beeps.
CPU not installed (not an
indicator of bad CPU).
CAUTION: Internal components might be powered even when the
computer is o. To prevent damage, disconnect the computer power
cord before you remove a component.
1. Verify that the CPU is present.
2. Reseat the CPU.
Diagnostic codes and errors 63

HP Z1 G2 Specifications

General

Brand	HP
Model	Z1 G2
Category	Desktop
Language	English