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I have one Sapphire Radeon HD 6950 2 GB DDR5 Graphics card in my computer.

Everything used to work great. One day my friend and I flipped the switch on it to enable overclocking and I overclocked for a little while. Everything was great. I only overclocked a little bit, nothing too crazy. The default is 800 Mhz, I think I bumped it to 850 Mhz tops.

A couple weeks later I purchased a 1080p monitor to go along side my 1650x1050. Everything was still going great.

A couple weeks after the monitor purchase, I notice that both of my monitors are flickering like crazy. Whenever I move the mouse, or scroll on a browser window for example. Horizontal lines are flickering all over the place. Almost looks like some of the image is displaced in a different location, but happens very fast.

I've realized that if I go into my resolution settings and change the resolution on the 1080p monitor from 1920 x 1080 down to 1650 x 1050 and then SET IT BACK UP to 1920 x 180, everything works great until I reboot the computer. I forget there is even a problem until that point.

I have now disabled the overclocking, and the flickering still occurs on startup.

Does anyone know what could be causing this? And why it is being "fixed" when I reset the resolution manually?

Update I just updated my motherboard BIOS, still flickers.

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Hey I have the same gfx card and i'm getting the exact same problem! Everything was working great! The only thing i have done recently is updated catalyst to 12.10. Could it be that? i don't know. Let me know if you find a fix, its really annoying having to change my res everytime i start the computer up!

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I never thought about that, maybe I should downgrade and see what happens. I think I also updated it. –  ardavis Nov 11 '12 at 1:32
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