I have a 55" Mitsubishi widescreen that I have had for about four years. Everything is fine but the color is off. Sometimes, it comes on with full color, then, in an instant, or very slowly, it turns to a blueish green tint. 95% of the time, the tv is in the blueish green tinted color on any input going through the HDTV interface. DVD and S Video inputs are fine. My local Mitsubishi repair people are baffaled. Anyone have any ideas or suggestions?