How do I fix login when the progress bar stops at 100%

Shinyglass wrote:

I have a MacBook Pro 13" mid 2012 which will not allow me to sign in. I have tried unsuccessfully Booting in safe mode, using Command, Option, P&R to reset NVRam & Pram, re-installed OS Catalina 10.15.6 & used First Aid, Recover Mode etc

This only happened yesterday but having spent many hours on this, I don't know what else to try. I see that this was a problem number of years ago but could not see any resolutions.

follow through here

If your Mac starts up to an Apple logo or progress bar

If your Mac starts up to an Apple logo or progress bar - Apple Support