I just got the Hitachi 57s500, just got hdtv installed today, and turned on the set, turned down the contrast and brightness to acceptable levels. That's it. When standing and looking at the top center of the screen, there is (and this is going to be hard to describe) what looks like a distortion in colors in the shape of a five to six inch V-shape, clearly visable if there's a bright background on the screen. At first I thought it was coming from a light or something in the room, so I put my hand over this V-shape and no, it isn't a reflection or shadow. But it looks as if it is. When I sit down and watch the set, you don't notice it. Any clues how to get rid of it?