Power - HP Media Center,Pavilion Media Center m8150 Troubleshooting Manual

Keyboard and Mouse (continued)
Symptom
I cannot move the cursor using
the arrow keys on the number
key pad.
Cursor moves only vertically
or horizontally (or it does not
move smoothly on the screen).
Optical mouse does not track
the cursor well.
Cursor moves too fast or
too slow.

Power

Symptom
Computer will not turn on
or start.
Possible solution
Press the Num Lock key. The Num Lock light should not be on if you want to use
the arrow keys on the number key pad.
Remove the rollerball cover from bottom of mouse (rotate it counterclockwise),
remove the ball, and clean it with a damp, lint-free cloth (not paper). Also
clean the rollers on which the ball moves.
Place the mouse on a mouse pad or white sheet of paper, or gently wipe the
light sensor lens on the bottom of the mouse with a lint-free cloth (not paper).
Adjust the cursor speed:
1 Click the Windows Start Button, Control Panel, Hardware and
Sound, and then Mouse.
2 Click the Pointer Options tab.
3 Adjust the Motion slider toward Slow or Fast to decrease or increase
the speed at which the cursor responds to mouse movement.
4 Click OK.
Possible solution
Ensure that cables connecting the computer to the external power source are
plugged in properly.
When the cables connecting the computer to the external power source are
plugged in properly, and the wall outlet is functioning, the green power supply
light on the back of the computer should be on; if it is not, refer to the Limited
Warranty and Support Guide to contact Support.
If the display (monitor) is blank, the monitor may not be properly connected.
Connect the monitor to the computer, plug it in, and turn it on. See "Display
(Monitor)" on page 9.
Set the line voltage selection switch to the correct setting for your country/
region, or refer to the Limited Warranty and Support Guide to contact Support.
Test the wall outlet by connecting a different electrical device to it.
Incompatible memory (RAM) may have been installed. Reinstall the old
memory to return your computer to its original state. For instructions, refer to
the Upgrading and Servicing Guide.
Reseat the hard disk drive data and power cables. For instructions, refer to the
Upgrading and Servicing Guide.
Troubleshooting Computer Problems
17