If it does it in games as well, the most likely culprit is the video card.
Have you messed with the cooling on the graphics card at all? If you replaced the heatsink, check to make sure the new one is seated properly. Overheating can cause lots of wonky things, including this.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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