I recently changed my GFX card to a Radeon HD 6670 (about a week ago), and yesterday when I booted my PC, instead of the standard Windows 8.1 log in screen, I got a black screen, with the occassional flicker of my mouse.
I managed to boot in safe mode, and disabled the GFX card. I downloaded the latest catalyst controller software, and everything was up to date already. I rebooted my PC in normal mode, and when the catalyst programme was installed, my GFX got reactivated, and everything seemed fine.
I turned my PC off last night and when I booted it again this morning, the same black screen appeared. It means I cannot even log on to Windows, I can only boot in safe mode (which is near impossible to achieve).
Does anyone have any ideas as to what is going on here?