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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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Starts to boot and fails

My church’s iMac starts to boot and then fails!

The Apple symbol and the progression bar displays and the bar gets to about 1/3 the distance and the system shuts down!

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Try restarting your system and press and hold the Command (⌘) and R Keys to get into the MacOS Recovery. Then run Disk Utilities on your drive. Here’s a bit more: How to reinstall macOS from macOS Recovery. You don’t need to install the OS just get the system running within the recovery partition.

Reference: Mac startup key combinations

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george matey will be eternally grateful.
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