That's why I asked if your PS3 was the only source that you see this problem in. You need to try other sources if you are going to troubleshoot. Which input are you using with the PS3? Try component if you are using HDMI, or vice versa if you are using component now. Try a 360, a PS2, a Wii, anything over the same or other inputs. The PS3 should have a setting for colour format, I don't remember exactly where it is, but its purpose was to expand colour for deep colour displays and to limit it for those that did not have this feature, similar to the 360's colour format. If you are seeing a problem now I would expect that changing this colour setting should fix it.