I've my Sony VPL-HS3 front end projector for about 2 years, about a month ago there was a streak of blue on the upper left hand corner. gradually, more and more of blue has been showing up on my screen mostly on the both and the top of the screen, the rest of the screen is fine and brightness and color is still tip top. At first I thought the lamp was burning out and I was just reluctant to replacing it. However this morning, I did replace the lamp with a fresh one and all the problems are still there. Could be a problem with the projector itself? The wiring? The Screen?