When I go onto my display->Settings->Advanced->Overlay page where all the slider controls are for brightness, contrast, gamma etc. I can't alter them any more but I used to be able to
I had a really dark film a while ago so I put the brightness up to the highest setting but now all the stuff I have which uses overlay mode to display (e.g. DVDs etc) is too bright, and I can't change it. I have tried reinstalling the display adapter device and reinstalling all the ATI control panel software and drivers but its still all frozen and greyed out.