I recently bought a msi radeon 7970 oc boost edition and I cannot go past the "choose an operations system" on windows 8.1. I have a 850watt psu so I know it's not voltage, I have a amd quad core and 16gb ram on a asus m5a97 r2.0 board. I cannot even get into my sign in screen it only displays a black screen with the mouse and that's it, would this be a gpu issue or what? Please help