Why my iMac won't turn on?
I turn off my iMac when is updating and there is sounds like fan when I push the button.
Thanks for your help.
모델 A1419 / EMC 3070 / Mid 2017 / 3.4, 3.5 또는 3.8 GHz Core i5 또는 4.2 GHz Core i7 Kaby Lake Processor (ID iMac18,3) / Retina 5K Display. 시스템이 매우 유사하므로 이전 iMac Intel 27" Retina 5K Display (Late 2014 & 2015) 안내서를 참고하십시오.
If your system is in the middle of an OS update you don’t want to shut the system down! Let it do its thing without disruption!
I fear you corrupted the system! Depending on what it was in the middle of you might be able to recover it using what @v3nuo posted above steps from Apple. If that fails to work you’ll need to bring your system into Apple to get them to fix it.
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