I currently just got a new AMD Radeon HD Graphics card series 6670 and it was working and installed all the current drivers correctly. After a while of use the screen went black and nothing was happening on the screen. I am still able to use my pc as I am able to plug a VGA cable into my motherboard as orginally there was no graphics card in the pc at all. When I reopen my pc to see whats is going on inside the graphics card fan was still spinning and is probly installed.
I cant seem to find a solution or find anyone els who is having the problem.