Intermittent blue circle on display

Yes this is certaintly a strange one, as you say not all channels have it?? Ok lets try to narrow it down a bit. Do you have cable or satallite ? Is the cable or sat. connectected through the video inputs or does your TV have to be on a certain channel? ok and you say its not there when your watching a dvd? The only answer here is that you have a problem with your cable or the sat system, as the channel stays the same on whatever channel your watching while on the cable, so if you have a problem with some and not others , Your TV dosent know the differance from one channel or another, as its always on the same channel on the tv . So what does this tell you?? Theres a problem with the sat or cable reciver! Cant be the TV as I said the TV doent know the differance from one channel to another as it always stays on the same channel. Sounds like you need toi have cable come in to check the impedence and signal streinth.. now if your sying thast the tvs on locals and some do it and others dont ?? then theres outside interference causeing this problem? Good luck