モデル番号A1311 / Mid 2011 / 2.5 & 2.7 GHz Core i5もしくは2.8 GHz Core i7プロセッサ

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iMac restarting on its own

About a year ago my iMac started restarting on its own. Thinking it was the HDD I swapped it with an SSD + HDD (a new one) setup.

Everything went well until a couple of months ago when it started restarting on its own once again. Sometimes it will work perfectly, while others it will just keep restarting until I uplug the cable.

I tried reinstalling Mac OS and for a while it worked flawlessly, but after some time it started behaving as before.

Running Onyx maintenance script sometimes stops the reset and allows me to use it for a day or so.

Is there anything I could try to troubleshoot it?

Thanks in advance

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Theres a good chance nothing is wrong!

Depending on the version of OS-X/MacOS you have installed the OS update service is likely just restarting your system after updating the OS with the maintaince release.

So what is your OS version and I would review the App Stop app looking at the install history to see if it updated your OS.

Update (02/12/2019)

OK, so your system was not installing any updates and its shutting down on its own during boot.

Then either your power coming into your building has issues or your power supply is failing. Its very rare for the power supply to be stable over long periods then go into a failed condition which is why I would focus on your homes power first.

Check your wall outlet is it properly grounded? Is the polarity correct? many hardware stores have outlet testers which you can plug in to test if they are correctly wired.

You may want to get an electrician in to check your AC breaker panel and the building grounding.

You may need to get a power meter from your power provider to monitor the power over a few days. It plugs into a free outlet and measures the voltage, the sine of the power as well as if your line has surges recording all of it. This is a free service here in the states. Your other option is invest in a good UPS.

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I don't think that's the problem, there are not pending updates or such.

It also restarts randomly while booting or it just fails to boot sometimes, so I don't think it has to do with that

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Thanks for the advice! I will try as soon as possible and hope for the best!

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Sporadicamente さん、ありがとうございました!
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