My MSI gtx 970 worked great until the other day. I turned on my pc and it stated it needed power to the pci-e (or something like that). I have a 750w power supply and I interchanged it with an 850w and had the same issue. I put my 750w PSU back in and replaced my GPU with an amd Radeon 200 series and it runs. Not sure if my MSI is just shot or what. Thanks everyone.