My wife's macbook is making a bubbling water sound. It is doing this constantly. When we ichat we have to talk over the sound, it's like chatting to a diver. I'm assuming it's something my daughter has done / changed. As she is currently in Argentina, my wife is in New Zealand and I'm in Singapore I'm having a little trouble getting to the bottom of it. A reboot hasn't helped. Thought of a faulty screen saver but can't see anything that would fit. The macbook is running Leopard. Any ideas?