24 Chapter 1
Summary of Useful Keyboard Combinations
To do this... ...press this key combination
Force the computer to restart Command (x)-Control-Power (®)
Force your PowerBook to
reset
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Shift-Function (Fn)-Control (ctrl)-Power (®)
Start up your computer from a
CD or DVD
Start up or restart your computer with the C key held down.
Disable all extensions Start up or restart your computer with the Shift key held down.
Tu rn off selected extensions
using the Extensions Manager
control panel
Start up or restart your computer with the Space bar held down.
Force a program to quit Command (x)-Option-Esc
Reset the PRAM
(parameter RAM)
Start up or restart your computer holding the
Command (x)-Option-P-R keys down.
Cancel the task the computer
is working on
Command (x)-.(period)
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For PowerBooks that do not have a reset button