Just upgraded my radeon hd 6870 to a gigabyte HD 7950 on a MSI 890FXA-GD70 MB. Started hanging on the 'Starting Windows' screen so thought it was a driver problem. Switched back to old card removed all old AMD Catalyst drivers, even flashed MB with new BIOS but to no avail. Old card still works but new HD 7950 still hangs on 'Starting Windows' Corsair TX750 PSU. Any help would be appreciated i'm dying here.