Just started up an old Dell 510 with a 4670 GPU. I last used it about 3 months ago and it was fine. When I started it up the GPU fan would spin up to speed then cycle down.It keeps repeating this whenever I try to start the PC and I get nothing on my screen. Does this usually happen when the fan or card itself is bad. Can i replace the fan itself or is it even worth it for a GPU that old.Thanks