hey all im looking for a second 5770 to put in my rig to go crossfire. I found a card that is classed as faulty. The fan spins, but no output display. Its a saphire 5770 around a year or so old. The question is do i risk buying it that it may work as a second card in crossfire? and if it doesnt would saphire honour any warranty remaining without proof of purchase? or is there maybe somewhere i could get it repaired?