Hi. Yesterday, my pc would not show any display from my GTX 570. But my onboard graphics worked fine. My GTX 570 doesnt even show up in device manager or in BIOS. So i thought it was a GPU problem. Then when booting up, i got a message Boot Disk Failure. So i changed the sata port the hard drive was plugged into and then it booted up fine but the GTX 570 still didnt work. But then I put another Graphics card in and it wouldnt show any display off that either. I could hear the GPU fan changing fan speed every few seconds. It would spin loudly, then quiet. Then loudly then quiet and so on.. So i am thinking that it is a motherboard problem. Any suggestions?