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iMac Beep and start up on its own

So it’s 4am in the morning and my 2011 iMac makes a very loud beep and turns on by itself, I used it earlier in the day and all seemed fine.

Whilst starting up the screen was black with a white loading bar and apple logo. I waited for the bar to load and it shut down again after.

Can someone explain to me why this has occurred?

Posted on Oct 1, 2018 8:24 PM

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Question marked as Apple recommended

Also check Energy Settings in System Preference for the Start up after power failure. If it is checked on, check it off. If your home momentarily lost power or had a power flicker that could explain it.

Posted on Oct 2, 2018 4:55 AM

3 replies

iMac Beep and start up on its own

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