ok so rescently my video card fan has been sounding rough. I had my machine cleaned and use it in a relativly dust free room. however once in a while the rough fan comes back and does not stop untill the machine has been off for a period of time. last evening while using my PC it stopped completely (blue screen and all) and started the windows startup repair tool and had to restore back to a prior restore pointthis worked but I am not sure for how long. my video card is an AMD HD radeon 7500 series do i need to replace it or is there something I can do that will give it more life?