Alright guys so I am running a radeon 6850 and this graphics card has done exactly what I have always needed it to do. Although After upgrading to windows 8 64 bit from windows 7 64 bit my HDMI (panasonic) TV is not working? Just a black screen. Although when I reboot I can see the motherboard post and windows 8 begin to load up. I have tried everything I personally can think of, resetting the drivers, screen resolution, frame rate, and booting with only the HDMI all resulting in the same problem. I know my computer is recognizing the connection because under my monitors it says " Panasonic TV" so whats up? I figured it might be something with windows 8? Due to the fact that it has always worked before.