I see a wide range of hues. Does your monitor have a reset degaz setting? Also, check the net for an updated driver for your vid card.

If your brightness and contrast are a high as they can go, I'm suspecting a failing monitor. Two routes to go there if it is... get a new one, or take it in and see if a fuse is failing and can be replaced for less than a new one would run you. Often, by the time they hit you with service fees, it just isn't worth it ... my dead monitors go to the curb (safely of course). If short on bucks ... decent used ones can be had at smaller repair shops, or computer shows.