How to start iMac that is non-stop rebooting itself?
Help!
When I try to start my computer, watching the progress bar fill up under the Apple icon, the screen will suddenly go black. Then the loud sound indicating it is rebooting and then the screen appears once again asking for my password. It repeats this over and over. (It is possible that this happened while trying to update to the new OS.)
I just tried both the chat and telephone support options but neither one of them works. Thanks for any suggestions you can offer!
iMac 27″, macOS 11.3