Does anyone here a really high pitched noise when the TV is switched on? I am referring in specific to LCD TVs (don't know about Plasma TVs). The sound becomes more conspicuous when I'm watching something on mute. This is very disturbing while watching television. What's more disturbing is that nobody else I know seems to hear this noise. Does anyone here hear it? What is it and why is it so annoying? Why is it only I can hear it?