HP EliteDesk 800 G1 Tower Service Manual page 231

Mouse does not respond to movement or is too slow.
Cause
Mouse connector is not properly plugged into the back of the
computer.
Program in use has stopped responding to commands.
Mouse may need cleaning.
Mouse may need repair.
Computer is in Sleep state.
Mouse will only move vertically, horizontally, or movement is jerky.
Cause
Mouse roller ball or the rotating encoder shafts that make
contact with the ball are dirty.
Solution
Shut down the computer using the keyboard.
Windows 7:
1.
Press the Ctrl and Esc keys at the same time (or press the
key) to display the Start menu.
Windows logo
2. Use the arrow keys to select Shut Down and then press
Enter.
3. After the shutdown is complete, plug the mouse
connector into the back of the computer (or the
keyboard) and restart.
Windows 8:
1.
Press the Windows logo
2. Use the arrow keys to select Power, and then press
Enter.
3. Use the arrow keys to select Shut Down, and then
press Enter.
4.
After the shutdown is complete, plug the mouse
connector into the back of the computer (or the
keyboard) and restart.
Shut down the computer using the keyboard then restart the
computer.
Remove the roller ball cover on the mouse and clean the
internal components.
See the Worldwide Limited Warranty for terms and
conditions.
Press the power button to resume from Sleep state.
CAUTION: When attempting to resume from Sleep state,
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.
Solution
Remove roller ball cover from the bottom of the mouse and
clean the internal components with a mouse cleaning kit
available from most computer stores.
Solving keyboard and mouse problems
+ l to open the Settings charm.
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