Clean your goddamn monitor.
okay well i have a media computer thats hooked up to my 52 inch tv in the living room... we just replaced its video card with a new one nothing impressive, but when we make the TV become the monitor everything is yellow its not that you cant see it its got like a yellow over lay on the whole screen... then when you hook it up to a normal monitor everything is perfectly fine...
wtf?
Clean your goddamn monitor.
do you hook it up to tv using: rgb cable? s-video? HDMI? most likely u have a short in the cable or u need to set the color average more towards red and blue and less green so there is not yellow everywhere
well we found out the problem one of the 12340203489234908234 pins in the monitor cable was bent...