HP Compaq dc7100 DT Reference Manual page 261

Solving Keyboard and Mouse Problems
Problem
Mouse does not respond to
movement or is too slow.
(continued)
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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.
Mouse will only move
vertically or horizontally, or
movement is jerky.
Service Reference Guide, dc7100
Cause
Computer is in
standby mode.
Input is coming from a
nearby wireless mouse.
Mouse roller ball is
dirty.
361288-003
Solution
Press the power button to resume
from standby mode.
1. Ensure that the mouse batteries
are fresh.
2. Place the receiver over 30 cm
(12 in) from a telephone, power
supply, transformer, computer,
other electrical device, or power
cords or cables.
3. The receiver should not be
placed on or inside of a metal
surface.
Remove roller ball cover from the
bottom of the mouse and clean it.
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