You run out of space on your desk before the mouse pointer on the screen reaches your destination.

You started your mouse move too near the edge of your desk or too near the stack of books and papers in the middle of your desk.

Lift the mouse off the desk and move it back to the center of the desk. The pointer won't move until you put the mouse back on the table and move it.

Mouse won't respond. You've already checked to make sure it's plugged in and that the application is designed for use with a mouse.

Mouse port is turned off in the Control Panel.

Change slot 4 from Your Card to Mouse Port in the Slots section of The Control Panel.

The mouse movements are jerky.

The ball on the bottom of the mouse is probably grimy.

Clean the mouse ball according to the directions that follow.

1. Turn the mouse over. On its belly you will see a black, plastic disc with a hole in its center. The disc has a round mark near its edge, which should be pointing to the letter L (for locked) engraved in the mouse. (See Figure B-1.)
    
2. Turn the disc counterclockwise one-eighth of a turn. This will bring the mark on the disc opposite the letter O (for open).
    
3. Cup your hands around the mouse and turn it right side up. The disc will fall out with the ball.
    
4. Wipe the ball clean. If it's greasy, wash it with warm, soapy water and dry it thoroughly with a lint-free cloth.

Figure B-1
Mouse belly

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Appendix B: Troubleshooting