I've had this monitor (Late 2007 DVI) for a while and today I woke up and turned it on and it seems that there's a piece of dust on the screen. It doesn't seem like dead pixels to me as I move my head around it seems to be behind the screen. It has soft edges. I attached a pic of it. PS. Is the LCD's top most layer changeable? Because I have some scratches on it from way back and would like to switch it without switching the whole screen. I'm very advanced with technical stuff like that, so it shouldn't be a problem.