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Model A1419 / EMC 3070 / Mid 2017 / 3.4, 3.5 or 3.8 GHz Core i5 or 4.2 GHz Core i7 Kaby Lake Processor (ID iMac18,3) / Retina 5K display. Refer to the older iMac Intel 27" Retina 5K Display (Late 2014 & 2015) guides as the system is very similar.

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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.

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Check out the post below by Apple and see if there’s any useful info, thanks!

If your Mac doesn't turn on or start up

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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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Albert noteinstein 将永远感激不已
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