I'm surprised by the loudness of the buzzing coming from the back of my one week old 436XDE. The noise is clearly audible when sitting 9 feet away from the front of the screen and unless the tv volume is set to medium to high, the buzzing can be heard over. I expected the screen to buzz slightly (it is an electronic component after all) but I feel it might be excessive, so would be keen to learn of anyone else's experiences. The only time the buzzing can't be heard is when there is temporarily an all black screen, e.g. for that small moment when flicking between channels. Even the small info box in the top right of the screen, when present on a black screen, is enough to cause a loud buzzing. Any thoughts please?