X1800XT Colour loss/change

had my 1800xt for about 6 weeks now and no probs untill lastnight, i thought everything was fine untill i went to my clan's homepage and found that instead of displaying the greys correctly it was displayed as different shades of greens. thought it might have been the site so tried another, this time the pale blues were displayed the same was in the various shades of green.

managed to correct it by reactivating the ati colour controls in the ccc, but when using it tonite the same thing is happening, and corrected it again, and have the latest 6.9 drivers.

does anybody know what the problem is? i thought it might be a heat related problem but shows a steady range of 45-50,and the last thing i want to do at the mo is rma it because i have no back up gfx card to use in the meantime.