Has any one else experienced the random, but rather persistent electrical sounding snap or click that occurs while navigating the computer mostly with the touchpad. It is not the hardisk (been replaced to no avail). One person on apple forums suggested that all Macbook Pros make a snapping sound because the soundcard is either powering up out of sleep or powering down. It occurs sometimes more frequently, others not at all. Apple has offered to replace the computer with a new one, but if this is an endemic problem with just about all of them, I'd rather keep the one I have. The snapping or clicking isn't resounding, but can be rather irritating in a quiet room. At first I thought it was a short circuit sound snapping but was convinced otherwise later. Any responses would be appreciated.