Technical information

m There is a software problem.
Restart your Macintosh. For instructions, see Chapter 11, “Start Here If Trouble Occurs.”
Check the startup disk and application program you were using when the problem occurred. To
check that the applications 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 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 “Checking Your System Extensions”
in Chapter 13.
If the problem recurs, you may need to reinstall system software. See “Installing System Software”
in Chapter 13.
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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