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m There is a software problem.
Restart your Macintosh. For instructions, see Chapter 9, “Start Here If
Trouble Occurs.”
Check the startup disk and application program you were using when the
problem occurred. To check that the programs and the system extensions
you’re using are compatible with the system software, restart while holding
down the Shift key; this temporarily turns off all system extensions. If your
computer works normally after you do this, use the Extensions Manager
control panel to turn on extensions and control panels one at a time.
Restart after you turn on each extension. This procedure should identify
any incompatible extensions and control panels that may be causing the
problem. (If you just added new software to your computer, its system
extension is the most probable cause of the problem.) For detailed
instructions, see the information about managing system extensions in
Macintosh Guide (or Mac OS Guide), available in the Guide (h) menu.
If the problem reoccurs, you may need to reinstall system software. See
Chapter 11, “Diagnostic Techniques,” for instructions.
m The keyboard is damaged.
If you have access to another keyboard, try using it instead. (Turn the
computer off before connecting it.) If the new keyboard works, there is
probably something wrong with the one 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.
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Solutions to Common Problems