but it sounds a lot like an overheat issue. Did you install the graphics card recently, or just update the drivers?
Even if the fan works, It could still be heating up from the increased load.
i am running windows xp with service pack 2 , and i am installing ATI Catalyst 5.3(the latest version) , My Card is "ATI Radeon 9000" , recently , In the middle of the games , the system reboots , i tried more than ane game but all are the same , after 15 to 30 mins of the game the machine reboots , and my processor's fan is working fine , this issue doesn't happen at all at applications except games , that's why i believe it's a driver issue ,the games i tried are C&C Generals , NHL 2005 and FIFA 2005 . Any suggestions?
thanx in Advance