My computer started making a quiet high-pitched noise a couple weeks ago. I believe it is one of the pieces of hardware that is spinning. I does stop when I go back and forth between web pages, when I move the slide bar on the right of the Window, and also when I move the cursor over different things on web pages. It doesn't being when the comp is turned on, but does after a few minutes. This has me baffled. Hard drive going bad? Fan on the video card? Thanks.