Mac mini
Won’t open up
Shows screen saver only
Mac mini, macOS 13.2
Question marked as
Hold the power button for 10 seconds or until the Mac mini shuts off.
Wait 30 seconds or so, then push the power button to turn the Mac mini on.
If that does not help, try Safe Mode. see > How to use safe mode on your Mac - Apple Support
If that still does not help, then have a look at > If your Mac doesn't start up all the way - Apple Support