er, wait, are you asking about restarting the machine and not shutting it down? If thats what your asking, I feel really stupid right now
As for a problem with the restart, that could also be a power issue, though I really don't think it is. I would check the knoweldge database some more and listen for smart people to respond to you from here instead of morons like me

sorry about that, I just gotta learn to read better. Peace
-b