Troubleshooting Guide www.hp.com 2–6
Troubleshooting
Computer will not
respond to USB
keyboard or mouse.
Computer is in
standby mode.
Press the power button to resume from
standby mode.
Keyboard or mouse is not
connected to computer.
Connect keyboard and mouse cables
to computer.
System has locked up. Restart the computer.
Ä
CAUTION: When attempting to resume from standby mode, do not hold down the
power button for more than four seconds. Otherwise, the computer will shut down and
you will lose any unsaved data.
Computer date and time
display is incorrect.
RTC (real-time clock)
battery may need to be
replaced.
✎
MConnecting the
computer to a live
AC outlet prolongs
the life of the
RTC battery.
First, reset the Date and Time
Properties in the Control Panel
(Computer Setup can also be used to
update the RTC date and time). If the
problem persists, replace the RTC
battery. See the Hardware Reference
Guide on the Documentation and
Diagnostics CD for instructions on
installing a new battery.
Cursor will not move
using the arrow keys on
the keypad.
The Num Lock key
may be on.
Press the Num Lock key. The
Num Lock light should not be on if you
want to use the arrow keys. The Num
Lock key can be disabled (or
enabled) in Computer Setup.
Poor performance is
experienced.
Processor is hot. 1. Ensure airflow to the computer is
not blocked. Leave a 4-inch
(10.2-cm) clearance on all vented
sides of the computer and monitor
to permit required airflow.
2. Ensure fans are connected and
working properly (some fans only
operate when needed).
3. Ensure the processor heatsink is
installed properly.
Problem Cause Solution
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