Just purchased a Sony KF-50XBR800 Grand Wega HDTV-ready LCD projection TV and seeing some weird green thing on screen. Have had tv for about week now and just noticed in lower left hand corner a faint green image that is fairly visible on black background. This image is about 4 inches high and 1 1/2 inches wide and slightly wavers back and forth, kind of like a blade of grass. Any ideas what this might be and possible remedies? Thanks.