HP Z400 Maintenance And Service Manual page 186

Table 6-1
Problem
Workstation seems to be
frozen.
Workstation date and time
display is incorrect.
Workstation appears to
pause periodically.
Cursor does not move using
the arrow keys on the
keypad.
Poor performance is
experienced.
Workstation powered off
automatically and the Power
LED flashes red 2 times (once
every second), followed by a
2-second pause, and then
two simultaneous beeps
sounded.
System does not power on,
and the LEDs on the front of
the workstation are not
flashing.
174 Chapter 6 Diagnostics and troubleshooting
Minor problems (continued)
Cause
Program in use has
stopped responding to
commands.
Real-time clock (RTC)
battery might need
replacement.
Network driver is loaded
and no network
connection is established.
The Num Lock
might be on.
Processor is hot.
Hard drive is full.
Processor thermal
protection is activated.
A fan might be blocked
or not turning.
OR
The processor heatsink is
not properly attached to
the processor.
System cannot power on.
Possible Solution
1.
If possible, use the Windows Task Manager to isolate and
terminate the offending process.
2.
Attempt the normal Windows shutdown procedure.
3.
Restart the workstation using the power button.
1.
Reset the date and time in the Control Panel.
2.
Replace the RTC battery.
Establish a network connection, or use the Computer Setup (F10) Utility
or the Microsoft Windows Device Manager to disable the network
controller.
key Press Num Lock. The Num Lock key can be disabled or enabled in the
Computer Setup (F10) Utility.
1.
Verify that airflow to the workstation is not blocked.
2. Verify that chassis fans are connected and working properly.
Some fans operate only when needed.
3.
Verify that the processor heatsink is installed properly.
Transfer data from the hard drive to create more space on the hard
drive.
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.
Verify that the workstation air vents are not blocked.
2.
Open the access panel and press the workstation power button.
3.
Verify that the system fan is running.
4.
Verify that the processor heatsink fan spins. If the fan is not
spinning, verify that the heatsink fan cable is plugged into the
system board connector and that the heatsink is properly seated.
5.
Replace the processor heatsink.
Determine if the problem is caused by a faulty device or a problem with
the power supply. Press and hold the power button for less than four
seconds while observing the hard drive LED:
If the hard drive LED turns green, then perform the Diagnose
●
faulty device procedure described below.
If the hard drive LED does not illuminate, then perform the
●
Diagnose power supply problem procedure described
below.
ENWW