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Blinking apple/null sign when booting up.

When I try to start up my macbook, the screen displays a blinking apple, then null sign(or universal sign for "no") in the center of the screen.

What does this mean, and how can I fix the problem.

Thanks.

MacBook

Posted on Sep 3, 2011 5:05 PM

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Blinking apple/null sign when booting up.

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