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Mensagem original de: scott cocking ,


I had the same issue with my iMac 27" late 2012 model, random shut down, pull the power cord, wait, plug back in, runs fine or a while, repeat every few days until it became daily.

I replaced the power supply board and it's all good... Only a few days so far with no problems for a REAL proof, but it was shutting down daily.

Key things?

I think the fact that I had to unplug after every shut down to be able to restart was a solid clue that it wasn't a software issue.

As Greg Blair pointed out, I ALSO have UNGROUNDED power to my machine. Maybe that is what kills the board? Just mentioning it here in case that turns out to be a common clue as well.