Mac Desktops forum


iMac 21.5 mid2011 powering off by itself? Model A1311

by Crissyanon / January 29, 2013 8:37 AM PST

My iMac is powering off all by itself. It's like some one is pulling the power cord out. Some time it can be on for an hour then turns off while other times only a few minutes. I've tried the SMC reset, bought a new power supply but its still powers off. Put it in the shop but no one knows. Some time it won't turn back on and other times it will.

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All Answers

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by mrmacfixit Forum moderator / January 29, 2013 8:53 PM PST

Any chance this machine has any sort of warranty left on it?

I'd probably go with heat related but short of taking it apart and making sure that everything is rotating as it should and that none of the vents were blocked, I couldn't even make a suggestion as to the cause or cure.

If there is any warranty left, perhaps the extended AppleCare one, now would be a good time to call Apple.

Did it ever do this before any warranty period ended, if it has?


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Apple Care
by Crissyanon / January 30, 2013 3:36 AM PST
In reply to: Applecare?

I no longer have any type of warranty. When I first bought it it did it a few times and never did it after that until a few months ago. No you can't use it. I've talked to Apple several times but no solution.

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Me too. As noted.
by R. Proffitt Forum moderator / January 30, 2013 3:39 AM PST

My thought is heat related. I can usually add credence to that by asking the owner how long it was since they used canned air on the vents. If they respond with "what is canned air?" then the likelihood it's some vent/clogged heatsink issue went up.

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