HP workstation xw4000 Getting Started page 13

Basic Troubleshooting
Solving General Problems (Continued)
Problem
Computer appears
locked up and will not
turn off when the power
button is pressed.
Computer will not
respond to USB
keyboard or mouse.
Computer powered off
automatically and the
Power LED is:
1. Flashing Red or
Yellow four times
per second, OR
2. Flashing Red or
Yellow two times
one second apart,
followed by a two
second pause, OR
3. Not flashing.
2–4
Cause
Software control of the
power switch is not
functional.
Computer is in
Stand By mode.
Ä
CAUTION: When attempting to resume from Stand By mode,
do not hold down the power button for more than four seconds.
Otherwise, Stand By mode is lost, and you will lose your data.
The unit temperature was
exceeded. The fan may
be blocked or not turning,
OR the heatsink is not
properly attached to the
processor.
The unit temperature was
exceeded because the
computer was functioning
with the cover or access
panel removed.
Solution
Press and hold the power button for at
least four seconds until the computer
turns off.
Press the power button to resume from
Stand By mode.
1. Unit is in an exceedingly hot
environment. Let it cool down.
2. Ensure that computer air vents
are not blocked and internal
fans are running (i.e. power
supply fan, chassis fan, and/or
processor fan).
3. Ensure that the heatsink is
properly seated.
4. Contact an authorized reseller or
service provider.
Replace cover or access panel, and
let the computer cool down before
attempting to turn on power to the
computer.
Getting Started