The video card that i have is a ati x800-XT and the heatsink fan will spin and work untill i go to the login screen where there it stops and when i need it to cool down my card in games, it just doesnt blow. I cleared all the dust that was on it, unscrewed it to see if any wires were out or anything and i could not find the problem. If anybody could help i really would appriciate it. thanks.