Ubuntu won't shutdown

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http://askubuntu.com – A bit of background first. I use my ubuntu computer as a media center and backup server, running Ubuntu 12.04. It's scheduled to shutdown at 1am everyday. My problem is that the computer does not shutdown. It attempts to as scheduled (sudo shutdown -h now), but then the computer stays on after halting. It also does this when i type it into command line or use the gui. The last thing it says is Will now halt [ 945.791650] Power Down The screen stays on and the computer doesn't stop, I have to use reset button or hold power button. I have already appended "acpi=force" to the grub conf (HowTos)