[ubuntu] Intel Mac Mini doesn't Shut Down Properly

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http://ubuntuforums.org – I recently installed Ubuntu 11.10 on my Intel Mac Mini, dual-booted with OSX Snow Leopard. I've been having a problem: the computer doesn't shut down all the way. I get the black screen with text describing the shutdown process, and eventually it says "halting now. system halted", but the computer doesn't turn off. It is the same for GUI shutdown or sudo shutdown now. Rebooting is the same, except it displays "rebooting now" instead of "halting now". Any help would be greatly appreciated. (Hardware)