The system software CD is located in the file cabinet near the monitor's Mac. When the diskette icon appears, double click on it. E. Open up the Norton Disk Doctor application in the diskette. I. Reboot the computer by hitting control, apple, and the key pointing to the left on the upper right corner of the keyboard at the same time. The disk became messed up in some fashion.
Individual causes are too numerous to mention.
Mouse doesn't work. A. Clean the mouse by turning it upside down and turning the disk counterclockwise on the bottom of the mouse until it is off. Remove the ball from the chamber and clean with a wipe from the supply cabinet the inside of the mouse chamber. Reinsert the ball and put the disk back on by turning clockwise until it clicks. If it still fails to work, ensure that the mouse is connected to the computer by tracing the mouse cord to the keyboard and tightening the connection by pressing the two connections together.