I just purchased a plasma TV. I have a cable box linked into the component inputs. I notice that if I am watching TV and then turn off the cable box (but not the TV), the screen goes blank and dark, but does the screen does not "shut" itself off completely. If you completely darken the room, you can notice that some light is being emitted from the screen. If the TV had no inputs and you turned it on, you get a brief message stating "no input signal" and then the screen goes completely blank, just the same as if the TV was turned off. In a dark room, you can see there is no light emitted from the screen. My question is the following: I recently went on vacation for one week, and when I came back, I noticed the TV had been on the whole time, in effect emitting that very dark signal into the screen (the first situation I described). Could this have affected anything on the TV, maybe akin to a uniform dark burn-in or something similar?