One of my computers is having issues with shutting down. When i go to start shutdown, about 15 seconds later the computer locks up completly. This happens every time i shut it down. When i go look in the event logs there is nothing out of the ordinary there. i am at a lose as to why this happens.
Try eliminating various applications etc prior to the shutdown, this sort of thing is often caused buy an app not shutting down properly.
Startoff by loading up in safe mode and seeing if you can shutdown nornally from there.
lockup during shutdown 
Linear Mode
