From some time ago I've been suffering a problem with my Mac Mini 4,1. I CAN'T TURN IT OFF!!! I think I've tried everything and I can't solve it. I've reinstalled SMC and the other thing I can't remember now, PRAM I think. I've restored Lion and the problem is still there. What could I try? Thanks
Try unplugging any devices hooked up to your mini. Anything connected may try to turn it back on. One other thing, go into activity monitor and see what is running. Quit the app and try to put the computer to sleep.
Is force quit working? Or holding the power button for extended periods?