I have just purchased a new lcd screen iiyama e435s (10 ms) and on my x600pr video card it works fine for about 2 minutes and then the screen starts jumping up and down.
I have tried connecting via DVI and norma DSUB. I have this problem on 1024768, 12801024 in 60Hz modes.
On my other pc the screen works fine (Nvidia Ti4200). Am i overlooking sumting? Can this be related to any setting of the video card?