Why does my laptop produce a high-pitched squeaky interference sound in the speakers and headphones. It's not very loud but its enough to annoy a person when they are trying to listen to music quietly. BTW its a 3-4 year old hp laptop with a pentium III 800 running Windows XP. If I remember correctly our old Acer Aspire desktop made the same types of noises. The pattern of the noise changes when you move the mouse or click on something. When you click and drag the scrollbar on the web browser the noise goes away completely. I know there's probably nothing I can do to remedy this issue but I just though I would try to get some insight on why it happens.