HP Z228 Maintenance And Service Manual page 75

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 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.
Red Power LED blinks three
times, once every second,
followed by a two-second
pause. Three beeps.
Red Power LED blinks four
times, once every second,
followed by a two-second
pause. Four beeps.
Red Power LED blinks five
times, once every second,
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).
CPU thermal protection CAUTION:
activated by either of the computer is off. To prevent damage, disconnect the computer power
following methods: cord before you remove a component.
● 1.
A fan might be
blocked or not
turning.
2.
●
The heatsink and fan
assembly is not
properly attached to
the CPU.
3.
4.
CPU not installed (not an 1.
indicator of bad CPU).
2.
Power failure (power CAUTION:
supply is overloaded). computer is off. To prevent damage, disconnect the computer power
cord before you remove a component.
1.
2.
Pre-video memory error. CAUTION:
computer is off. To prevent damage, disconnect the computer power
cord before you remove a component.
Recommended action
N/A
Internal components might be powered even when the
Make sure that the computer air vents are not blocked and the
cooling fan is running.
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.
If fan is plugged in and seated properly, but is not spinning, the
problem might be in the CPU fan. Contact HP for assistance.
Verify that the fan assembly is properly attached. If problems
persist, there might be a problem with the CPU heatsink. Contact
HP for assistance.
Verify that the CPU is present.
Reseat the CPU.
Internal components might be powered even when the
Open the access panel and make sure that all power
connections are secure on the system board.
Check if a device is causing the problem by removing all
attached devices (such as hard, diskette, or optical disk drives,
and expansion cards.) Turn on the computer. If the system
enters the POST, power off and replace one device at a time;
repeat this procedure until failure occurs. Replace the device
that is causing the failure. Continue adding devices one at a time
to make sure that all devices are functioning properly.
Internal components might be powered even when the
Diagnostic codes and errors 65