When you start up the computer, the display lights up for a moment, then shuts down.
mMake sure you are using the correct power adapter for your computer model.
mIf the computer is running on the battery, make sure the battery is charged. Or connect the external power adapter.
Problems working with programs
The computer freezes or displays a system error message.
mThere may be a temporary software problem. To reset the computer, try the following suggestions in order until the computer starts up normally:
1.If the computer freezes, you can try to quit the program you’re using by pressing the keys Command (x), Option, and Esc on your keyboard. Click Force Quit in the dialog box that appears. (You’ll lose unsaved changes in that program’s documents.)
Immediately save all open documents and quit all open programs, then restart the computer.
2.If you see a message about a system error, you may need to reset the
computer. The method of resetting you should always try first is to press the Command (x), Control, and Power keys simultaneously. If the
computer does not start up, connect the power adapter (if it is not already connected) and press the reset button (marked with the icon I) on the back panel.
Note: You will lose any work you have not saved.
3.Reset the PRAM (see “The Computer Makes an Unusual Sound at Startup, or You See a ‘Sad Macintosh’ Icon,” in the section “Problems Starting Up the Computer” earlier in this chapter for instructions.)
mIf the problem recurs, it may involve one or more of your application programs. See “The Computer Exhibits Odd Behavior, Such as Many Unexplained System Failures,” next.
About the codes in error messages: The number codes in error messages are used in software development. Sometimes they can help a technician narrow down the source of a problem. However, the codes are usually too general or technical in nature to help you diagnose a problem yourself.
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