Was it always like this if it want go to the start botton on windows all programs accessories then system restore restore it to the date it was normal if that dosent work then re install the disk that came with the monitor if there was no disk try playing with the monitors color settings and if then still dosent work!! then right click your desktop then click properites then settings tab then there should be a little bar at the bottom you can mode ajust it to the right setting hope this helps rate!