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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.

Power button does nothing unless held while unplugged

My IMac does not respond when I press the power button. The only way I get anything is when I hold the power button while plugging it in then pressing it again. Yet, the fan spins but the second diagnostic led does not light nor does the mac boot. Tried clearing SMC but nothing.

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Has this been fixed?

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It appears to be a power supply issue. Could you try replacing the power supply?

iMac Intel 27" Retina 5K Display 电源图片

指南

iMac Intel 27 英寸 Retina 5K 显示屏电源更换

难度:

中等

1 - 2 hours

iMac Intel 27" EMC 2639图片

指南

How to find and read the Diagnostic LEDs

难度:

困难

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I have a 2007 MacBook Pro that had the same issue, and I discovered it was because it had no battery, and a low wattage power supply.

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Bradley Crawford 将永远感激不已
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