Hello... i just bought a used asus 4870 everything looked fine.. so i took it home installed it... but i noticed the fan never turns on.while i was installing the drivers...it got quite hot so i turned off the computer... waited 15 mins turned it on again.. in ATI's control panel.. it even saids fan speed 0% i tried changing the settings but it never turns on.. said the temp was around 85C so i just turned the computer off and took the card out... did i just buy someone's problem is there anything i can do? it's an 'EAH4870" model from asus. Can I even RMA this? it's not like i have a reciept,box or anything... can I buy an aftermarket heatsink/fan ?? Thanks for the help 