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Article: Update Your OS X Mountain Lion App to 10.8.3 Same thing here, screen just locks up, mouse keeps moving. Been running in -x mode for the last week - update sucks.

One thing I was never able to get working, sleep. Appears that it never fully goes to sleep mode, display goes off but light stay on, drives and fans never spin down. And it will never resume from this state unless a hard power switch or reset. Noticed that a lot of people report this problem...

Also had the kernel panic on my system, choose -x at boot time and then reinstall what ever is causing the kernel panic. For me it was necessary to reinstall the audio device.

boot verbose mode and check for error causing the hang