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Chapter 4 Troubleshooting 57
If the computer freezes during startup or you see a flashing question mark
 Wait a few seconds. If the computer doesn’t start up after a delay, shut down your
computer by pressing and holding the power button (®) for about 5 seconds, until
the computer shuts down. Then hold down the Option key and press the power
button (®) again to start up your computer. When your computer starts up, click the
hard disk icon, then click the right arrow.
 After the computer starts up, open System Preferences and click Startup Disk. Select a
local Mac OS X System folder.
 If the problem occurs frequently, you may need to reinstall your system software
(see “Reinstalling the Software That Came With Your Computer” on page 58).
If the computer won’t turn on or start up
 Make sure the power cord is plugged in to the computer and in to a functioning
power outlet.
 If that does not work, press the power button (®) and immediately hold down the
Command (x), Option, P, and R keys until you hear the startup sound a second time.
 If that does not work, unplug the power cord and wait at least 30 seconds. Plug the
power cord back in and press the power button (®) again to start up your computer.
 If you are still unable to start up your computer, see the service and support
information on page 64 for information about contacting Apple for service.