Ever had the R part of the RGB disappear?
I was building my new computer, and took several components out of the old one. I took out the video card, a Geforce 6800GT, and set it on top of my (plastic) case. After I got everything I needed, I put the video card back in, and gave the case, containing the mobo, the CPU, and the graphics card, all properly installed, to my boss for him to play with at home. However, in two days of trouble shooting, he can't get any red to come from the video card. The blue and green channels are fine, giving everything a teal tint.
He's reseated the card, changed monitors, tried an analog to digital adapter, and verified the cable worked by using it on another monitor. He's running a 19" Acer LCD monitor.