HP Dx5150 - Compaq Business Desktop Troubleshooting Manual page 23

Solving General Problems (Continued)
Problem
Cursor will not move
using the arrow keys on
the keypad.
Poor performance is
experienced.
Troubleshooting Guide
Cause
The Num Lock key
may be on.
Processor is hot.
Hard drive is full.
Low on memory.
Hard drive fragmented.
Program previously
accessed did not release
reserved memory back to
the system.
Virus resident on the hard
drive.
Too many applications
running.
Cause unknown.
www.hp.com
Troubleshooting Without Diagnostics
Solution
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. Make sure the airflow to the
computer is not blocked. Leave a
4-inch (10.2-cm) clearance at the
back of the system unit and
above the monitor to permit the
required airflow.
2. Make sure the fans are
connected and working properly
(some fans only operate when
needed).
3. Make sure the processor heatsink
is installed properly.
Transfer data from the hard drive to
create more space on the hard drive.
Add more memory.
Defragment hard drive.
Restart the computer.
Run virus protection program.
1. Close unnecessary applications
to free up memory.
2. Add more memory.
Restart the computer.
2–7