HP Z230 Workstation - Maintenance and Service Guide

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.
Activity Possible cause Recommended action
Blue Power LED
*
on. No
beeps.
Computer on.
N/A
Blue Power LED
*
blinks
every two seconds.
*
No
beeps.
Computer in Sleep mode
(S3-Suspend to RAM).
Select models only.
Blue Power LED
*
is off.
*
No
beeps.
Computer in Hibernate
mode (S4-Suspend to
disk) or system is off (S5).
Blue Power LED
*
blinks
three times*, once per
second.
*
No beeps.
Computer in Sleep mode
(S3-Suspend to RAM).
Select models only.
Blue Power LED
*
blinks four
times*, once per second.
*
No
beeps.
Computer in Hibernate
mode (S4-Suspend to
disk).
User-selectable 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. Make sure 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. Make sure
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.
Red Power LED blinks three
times, once every second,
followed by a two-second
pause. Three beeps.
CPU not installed (not an
indicator of bad CPU).
1. Verify that the CPU is present.
2. Reseat the CPU.
Red Power LED blinks four
times, once every second,
followed by a two-second
pause. Four beeps.
Power failure (power
supply is overloaded).
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. Open the access panel and make sure that all power
connections are secure on the system board.
92 Chapter 4 Diagnostics and troubleshooting