A few weeks ago the color suddenly got screwed up on my computer - green looks yellow and red looks mostly black. I was going to just replace the monitor, but I'm not actually sure what the problem is, and I have been very happy with the monitor - Sony 19" Trinitron. I upgraded my video card a few months ago (to play HL2) to a G-Force FX 5500 Does anyone have any suggestions?? Please help. Thanks.