Ok, I just installed Win 7 on my laptop that had Vista on it. Now when I close the lid and it goes into Sleep mode, it makes a POP sound right at the time it shuts down. I do not get the same pop when it comes out of sleep. It's not the speakers because I still get it when the volume is muted. Is this an issue anybody has heard of before, and if so, anything to fix it? I've installed all updates. Thanks for any comments.