iMac screen frozen can’t access with mouse
iMac screen frozen and can’t access with mouse
iMac 27″, macOS 10.13
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Press and hold the power button until the iMac turns off. Then restart in Safe mode (hold the shift key down at startup), login and then restart the Mac again normally. It can take much longer (10 min) to safe boot so be patient.
How to use safe mode on your Mac - Apple Support
Safe mode forces the OS to clear certain caches and logs and do other miscellaneous housekeeping. It's non-destructive to user data so is safe to do. Very often certain weird software behavior is corrected by simply logging in this way as a troubleshooting method. When you're in safe boot, the machine will not be at its best performance, especially with graphics, but that's normal.
While you're at it, make sure the battery in the mouse is new or has a good charge.