Indefinite Hang on Reboot/Shutdown

view story

http://crunchbanglinux.org – Hey gang. Simple but head-scratching problem. Sometimes, and only sometimes, my system refuses to shut down or reboot. Using either the Exit menu, or the requisite commands for shut down or reboot in Terminal, the system just sits and waits. I can use the system as normal while the ghosted box for Shutdown "Please Wait.." is on screen, indefinitely. Likewise, when I shut down or reboot from the terminal, the message "The system is going down for reboot NOW" shows up, but nothing happens. Sometimes it works as normal. So I'm mightily confused. Here's the GRUB, if i (HowTos)