HP Compaq Pro 6305 Maintenance And Service Manual page 166

Table 8-9 Solving Mouse Problems (continued)
Mouse does not respond to movement or is too slow.
Cause
Mouse may need cleaning.
Mouse may need repair.
Computer is in standby mode.
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.
A wireless keyboard/mouse is not working correctly. Symptoms include lagging mouse movement, jumpy mouse/
keyboard, or no function of mouse/keyboard and external drive.
Cause
If your computer is equipped with USB 3.0 ports, connected
USB 3.0 devices can interfere with the wireless keyboard
USB receiver.
158 Chapter 8 Troubleshooting Without Diagnostics
Solution
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 standby mode.
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.
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.
Solution
Connect the wireless keyboard USB receiver to a USB 2.0
port that is separated from ports with USB 3.0 devices. If you
still experience interference, you may have to place the
connectors farther apart using an external USB hub.