Please help im a bit of a novice and have had my TW-10 for a couple of weeks now and have been very happy with it. Tonight I noticed a green mark on the screen which looks like a dust mark maybe,I dont think its a dead pixel as it looks like a small line that runs diagonally across. Its very small but its quite annoying u keep looking for it I have wiped the outside of the lense with a lense cloth but the mark is still their! So is it possible that dust has gotten inside the projector? can anyone please give some advice on getting rid of it?