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Model A1419 / EMC 2806 / Late 2014 or Mid 2015. 3.3 or 3.5 GHz Core i5 or 4.0 GHz Core i7 (ID iMac15,1); EMC 2834 late 2015 / 3.3 or 3.5 GHz Core i5 or 4.0 GHz Core i7 (iMac17,1) All with Retina 5K displays

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How to fix iMac bootlooping?

Hey y’all. An iMac in my office has been bootlooping for a while now. When you push the power button, it makes the usual start up sound, but the white progress bar is so slow and only gets to about halfway before restarting. An error screen flashes for a few seconds sometimes, but I haven’t gotten a photo of it yet, but will update the post when I do.

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crwdns2889612:0crwdne2889612:0 1
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Give this a try restart the system and press and hold the D key to enter into diagnostics. Let us know what errors you get if any.

Reference: Use Apple Diagnostics to test your Mac

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