My computer just rebooted for no reason, and all the fans seemed to kick into high speed. It didn't actually reboot though, just kind of stayed black (like before the mb logo pops up). Had to manually turn it off. Seems fine though now.
Anyone have a clue what it might be? One of my case fans died recently, but I wasn't doing anything intensive and heat really isn't an issue as I still have 4 other case fans.
ATI sapphire 4870