HP Compaq dx2200 MT Troubleshooting Manual page 9

Troubleshooting
Problem
Computer will not
respond to USB
keyboard or mouse.
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.
Cursor will not move
using the arrow keys on
the keypad.
Poor performance is
experienced.
6
Cause
System has locked up.
Keyboard or mouse is not
connected to computer.
Computer is in
standby mode.
RTC (real-time clock)
battery may need to be
replaced.
✎
Connecting the
computer to a live
AC outlet prolongs
the life of the
RTC battery.
The Num Lock key
may be on.
Processor is hot.
www.hp.com
Solution
Restart the computer.
Connect keyboard and mouse cables
to computer.
Press the power button to resume from
standby mode.
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 CD for
instructions on installing a new
battery.
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.
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.
Troubleshooting Guide