Apple Macintosh LC 580 User Manual

Page 57

Check the startup disk and program you were using when the problem
occurred. Make sure that all programs, desk accessories, and system
extensions you’re using are compatible with the system software. Try
starting up the computer from the Disk Tools disk or the CD-ROM disc that
contains system software. (For instructions on how to start up your
computer from the CD-ROM disc, see “Starting Up From a CD-ROM
Disc” in the section “Initializing a Hard Disk” later in this chapter.) If your
computer starts up normally, there may be an extension conflict.

If the problem recurs, you may need to reinstall system software. See
“Installing or Reinstalling System Software” later in this chapter for
instructions.

m The mouse is not connected properly.

Turn the computer off using the power switch, check that the mouse and
keyboard cables are connected properly, and then restart the computer.

m Signals from the mouse are not reaching the computer, either because

the mouse needs cleaning or because there is something wrong with
the mouse.

Clean the mouse according to the instructions in Appendix A of this book.

If you have another mouse or pointing device, try connecting and using it.
(Turn off the computer before connecting it.) If the new device works, there
is probably something wrong with the mouse you replaced.

If none of these procedures solves the problem, consult the service and
support information that came with your computer for instructions on how to
contact an Apple-authorized service provider or Apple for assistance.

Typing on the keyboard produces nothing on the screen.

One of the following is probably the cause:

m Your system has a software problem.

Restart your Macintosh. For instructions, see “Start Over” in the section
“When You Run Into Trouble” earlier in this chapter.

Check the startup disk and application program you were using when the
problem occurred. Make sure that all programs, desk accessories, and
system extensions you’re using are compatible with the system software.

Troubleshooting