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iMac with a grey screen - won't boot

I downloaded some Apple updates. Now when I turn on my iMac, I get a grey screen, spinner, and progress bar. When the progress bar finishes, the computer shuts down a short while later. I'd appreciate any help.

iMac

Posted on Apr 27, 2014 8:21 PM

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iMac with a grey screen - won't boot

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