My computer doesn't turn off normally. I didn't notice till recently as I had to restart it. I can only force a reboot on my computer or otherwise it stays in the XP blue screen.
it happens when u shutdown ur computer often with the shutdown button so it doesnt give windows to save all the shit etc so it gets sorta bugged and shutdown wont work anymore via windows.
I dont know a solution .. maybe wait a while till it really doesnt shut down