I upgraded a few months ago from my Dell stock AMD Radeon card to the AMD HD 7950 card. I also upgraded the power supply to a PM850. My TV is a Samsung HL67A750A1F. I use the DVI to HDMI cable and have also named the input port on the TV to PC.
When I had the stock video card in, the picture on the TV was great, though I had to lower the screen resolution on the PC as the TV would flicker on and off. I have the Duplicate the Displays checked under Multiple Displays.
When I installed the HD 7950, the TV picture was still great, though I still had to lower the PC resolution, this time to 1360x768. Well, a few weeks ago, the TV started to flicker no matter what resolution I set. I have been searching Google to try and figure this out.
Today I removed the HD 7950 and reinstalled the stock card again and the TV picture was great again.
Now my PC screen is unaffected by any of this. It always has a great picture.
My TV does have the white dots on the screen as it is a DLP. I have about 7 of them and it means my DLP Chip needs to be replaced. So I am wondering if this could be the cause of the flickering while trying to view the TV as a monitor?
Though the gaming consoles and DirecTV all workfine on it. Only the PC seems to cause the flickering.
I'm running the latest Radeon AMD Software.
This 17 second video shows what the TV is doing.