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My iMac (late 2014 with Intel) failed and recovery let me erase and reinstall Catalina. I reset the login, etc. but in the middle of using the iMac it reboots. I've tried disk utility to do first aid to the data drive. Still reboots. I've read about starting in Safe Mode, but not sure where to go from there. Maybe the iMac is just fried?
[Re-Titled by Moderator]
I suspect the internal HD has failed and you are attempting to reinstall Mac OS on a failed drive. I recommend that you take the computer to your local Apple Authorized Service Provider ( Apple Repair and Repair Status Check - Official Apple Support ) and have the computer professionally diagnosed so you know what you are dealing with rather than trying to troubleshoot yourself.
Start up from macOS Recovery
Option-⌘-R
Upgrade to the latest macOS compatible with your Mac.
In Disk Utility>View, select Show all Devices, highlight the top left entry.
Run Disk First Aid on all items in the left panel, from top down.
APFS won't work for Sierra or earlier, Sierra or earlier needs MacOS Extended Journaled. High Sierra won't work for APFS on earlier Macs.
If all else fails...
High Sierra “The Recovery Server Could No… - Apple Community
Use http:// instead of https://
https://www.youtube.com/watch?v=ouNQS36dIBw&t=95s
The formula for caos: APFS+macOS High+EFI… - Apple Community
How to recover a Deleted Hard Drive durin… - Apple Community
Hi,
Try to check your iMac with Apple Diagnostics if it reports some error.
Use Apple Diagnostics to test your Mac - Apple Support
Why does my iMac that keeps rebooting after Catalina reinstallation?
