[ubuntu] Black screen on reboot in 12.10

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http://ubuntuforums.org – I'm not quite sure what's causing it, but whenever I reboot instead of the login screen, I've got a black screen with the mouse cursor. If I hit ctrl alt f2 I can login, delete .Xauthority and change my home folder ownership to my account. If I do these things, next time I shut down all the way and then boot up, it loads properly. I'm running 12.10 from a clean install. This is a really annoying issue, if anyone can help it would be greatly appreciated! (Hardware)