HP Compaq dc5700 MT Reference Manual page 188

Troubleshooting Without Diagnostics
Solving Keyboard and Mouse Problems (Continued)
Problem
Mouse will only move
vertically or horizontally, or
movement is jerky.
D–24
Cause
Computer is in
standby mode.
Mouse roller ball or the
rotating encoder shafts
that make contact with
the ball are dirty.
437804-001
Solution
Press the power button to resume
from standby mode.
When attempting to resume
Ä
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.
Remove roller ball cover from the
bottom of the mouse and clean the
internal components with a mouse
cleaning kit.
Service Reference Guide, dc5700