Why my iMac 27 2010 turn off by itself?

Why my iMac 27 mid 2010 turn off by itself?
I already replaced the Power Supply part number 661-5972. The next thing is replace all the thermal sensors and then the logic board. I do not have any other way to find out what it 's wrong with it.
Last the same time that the old power Supply. Let it sit for a few hours. Turn back on and works fora few more days or weeks ans suddenly turn off again.
I am 66, started out with Apple around 87 as an independant service provider here in PR and have never had so much problem with any other mac's than this one.
Apple support provider here in PR have no expertise what so ever in giving us solutions to problems. Even thought I still doing some support to some of the old customer I am handicap with new technical tools to solve problems within new products. I wish Apple would have consideration on the old ones that help and support apple products without their help.
Thank you for reading my note!
Jose A Marrero

I can relate Jose
Have you looked under the hood of a newer car, worked on a new toaster or coffee maker..? Most all of them have sealed components that are no longer repairable, you throw the old part away and replace it with a new part or just replace the whole thing.
Heck' for the most part even the Geniuses at the bar are unable to fix or do anything about most hardware problems. So instead of trying to fix a product that is under warranty, they either send it out or replace it with a new Mac, Pad, Pod or Phone on the spot.
As another Apple user like yourself with some hands in experience and some time here in ASC, it sounds more like either a overheating graphic's chip or bad SMC chip than a temperature sensor problem. Both of which the normal Hardware Test will not catch.
So on that note: I would probably closely monitor all the temperature sensors (especially the GPU temperature) with iStat Pro or Temp Monitor to see if you can catch an overheating component that is causing the shutdown.
It also might help to post the Consol Message for the shutdown here in the ASC forum.
Dennis

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bye

Why my iMac 27 2010 turn off by itself?

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