HP M8200n PC Troubleshooting - Page 21

Keyboard and Mouse (continued) Symptom Possible solution I cannot move the cursor using Press the Num Lock key. The Num Lock light should not be on if you want to use the arrow keys on the number the arrow keys on the number key pad. key pad. Cursor moves only vertically Remove the rollerball cover from bottom of mouse (rotate it counterclockwise), or horizontally (or it does not remove the ball, and clean it with a damp, lint-free cloth (not paper). Also move smoothly on the screen). clean the rollers on which the ball moves. Optical mouse does not track Place the mouse on a mouse pad or white sheet of paper, or gently wipe the the cursor well. light sensor lens on the bottom of the mouse with a lint-free cloth (not paper). Cursor moves too fast or too slow. 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. Power Symptom Computer will not turn on or start. 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