HP Compaq Presario,Presario 8000 Getting Started page 108

Finding Help & Support
Keyboard and Scroll Mouse (Continued)
Symptom
Mouse moves only vertically
or horizontally.
7–22
Problem
Mouse roller ball is dirty.
Mouse needs repair.
Solution
Remove roller ball cover from bottom of mouse and
clean with mouse cleaning kit (available from most PC
stores).
See the Warranty and Support Guide for details.
Getting Started