I've suddenly got a large number of (what I think is) dead pixels on my Sony. They appear as small green splodges, for want of a better word, mainly visible on blue scenes like sky or water. This has happened almost overnight, it was fine yesterday! There's nearly 20 of them dotted right across the picture. My other explanation is dust getting inside.... I've had the window open much of the time due to the heat. Are there any recommended ways of cleaning inside a projector? Projector is about 4 months old and has 50 hours on the clock. I've also been noticing glitches on the screen i.e. the screen flickers occasionally but I think that's the DVD player! Not having much luck at the moment!