HP Dx5150 Troubleshooting Guide - Page 23

Num Lock, Problem, Cause, Solution, Continued

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Troubleshooting Without Diagnostics Solving General Problems (Continued) Problem Cause Cursor will not move using the arrow keys on the keypad. The Num Lock key may be on. Poor performance is experienced. 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. 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. Troubleshooting Guide www.hp.com 2-7

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Troubleshooting Guide
www.hp.com
2–7
Troubleshooting Without Diagnostics
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. 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.
Hard drive is full.
Transfer data from the hard drive to
create more space on the hard drive.
Low on memory.
Add more memory.
Hard drive fragmented.
Defragment hard drive.
Program previously
accessed did not release
reserved memory back to
the system.
Restart the computer.
Virus resident on the hard
drive.
Run virus protection program.
Too many applications
running.
1. Close unnecessary applications
to free up memory.
2. Add more memory.
Cause unknown.
Restart the computer.
Solving General Problems
(Continued)
Problem
Cause
Solution