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With about 10 minute intervals I keep getting a popup-message saying "Are you sure you want to shut down?" With options; sleep, shutdown, cancel etc.

Usually I hit Cancel to remove the dialoge box, but if I leave it open the computer eventually short circuit and dies.

I've searched around for possible solutions, but all I can find is some problem with the 30" Cinema Display - which I do not have, or use.

Does anyone have any ideas?

Update: The computer also has trouble booting - only way I can get it started is to boot while holding F1. If I do nothing but hit the power button the computer short circut right after the startup sound and Apple logo appears.

Update 2: It seems the popup only appears if the computer is idle. If I keep using the keyboard or trackpad nothing happens.

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My suggestion would be to bring it to Apple and have it repaired. – slhck Dec 26 '11 at 17:19
@slhck Yes, I'll probably to that as soon as I'm back from vacation. Btw, do you know a way to disable the power button? I suspect the fault lies there... – Orolin Dec 26 '11 at 18:10
Most probably not. Its function is mostly hardware based (or not accessible in OS X) – slhck Dec 26 '11 at 18:43
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