Unexpected mains power shutdown
My late 2015 iMac 27 5K developed a fault earlier this year: it started shutting down unexpectedly, initially once or twice a day up to every two to three minutes. I checked the power cord, used different power outlets in different parts of the house, booted in safe mode, checked the syslog file for any error messages which could explain this, no explanation found. Important: after each unexpected shutdown I had to reset the SMC to get the machine to react to the power-on button again.
Took it to the Apple store for a repair. As the machine displayed these unexpected shutdowns while at the store they replaced the logic board and the power supply. Machine worked fine for a few weeks and then started shutting down unexpectedly again. Back to the Apple store again where this time the machine apparently ran fine for one week without any problem.
Back home within two hours started shutting down again, now every two minutes, so unusable. Does anybody have any idea what could make the SMC shut down the machine? Is it a (false) high temperature warning?
Which other part might need replacing?
Could there be another problem causing damage to the logic board and/or power supply?
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I have a same problem with my iMac 2017 5k 27", already send for diagnose and repair, the repair man diagnose with high processor temperature, they suggest to down grade with i5 7600, after change the problem is still the same, I also thought its a logic board problem, seem like many users here change PSU & LB still facing the same problem after few weeks, I might try UPS
- de Fahrul Tajien
I am having this trouble too. Same imac 27 2015 retina. No problems with other equipment. I need to remove power to the imac and reintroduce before it will start up again. Seems like a common issue on the web.
- de Jim Phipps
You need to check your AC power. I strongly recommend you get a UPS
- de Dan
I am having the same issue on my mid-2015. I have a mini Mac on the same power strip and it doesn't have a power shutdown issue.
Of course my warranty is over. What parts would cause this?
- de Sean
Sean - Make your sure your power is clean and your house ground is good. I would first move your Mac mini to a different circuit so you can be sure you'er not over loading your line. Dedicate the line for your system and use a good surge suppressor or better yet get a UPS.
If you are still encountering issues I would recommend you visit an Apple Store to have them test your system. There are quite a few possibilities so one can't just tell you its this vs that.
- de Dan
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