Mac won't boot up past log on screen
Mac won't boot up past log on screen. I enter password. It sometimes boots to start screen but within 30 seconds reboots again back to log in or just turns off completely??
iMac 27″, macOS 12.6
Question marked as
Hoping you have a recovery partition.
Hold down the Command-R button at boot, select recovery.
If you get this far the Mac will boot into a 'safe place'.
From there look for DiskUtility and run it.
Link for further reading - Mac startup key combinations - Apple Support