HP Z400 Maintenance And Service Manual page 208

Table 6-8
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. The BIOS option you select controls the
blue LED function during these suspend modes. See
Computer Setup (F10) Utility menu on page 34
For the following LED activity and beeps, the beeps are heard through the chassis speaker. Blinks and beeps repeat for 5 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 two-second
pause. Three beeps.
196 Chapter 6 Diagnostics and troubleshooting
Diagnostic lights and audible codes
Possible cause
Workstation on.
Workstation in Sleep mode
(S3-Suspend to RAM). Select
models only.
Workstation in Hibernate
mode (S4-Suspend to disk)
or off state (S5).
Workstation in Sleep mode
(S3-Suspend to RAM). Select
models only.
Workstation in Hibernate
mode (S4-Suspend to disk).
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).
The
for details.
CAUTION: Internal components might be powered even when the
workstation is off. To prevent damage, disconnect the workstation power
cord before you remove a component.
1.
Ensure that the workstation 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 workstation 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.
1. Verify that the CPU is present.
2. Reseat the CPU.
Recommended action
N/A
ENWW