I think i have seen something about this in the forums but i can't seem to find it now. I have noticed that when the car is on and Media is muted, climate control off (in other words, should be quiet in the car) I hear a humming type sound (could also be characterized as low frequency static) coming from the front (seems just behind the 17" screen). It almost sounds like it could be a pump running or something like that and i can't remember if it was doing this from the start or not. Now that i have noticed it I hear it all the time. anyone else notice this type of noise?