Usually when you first turn on the Mac in the morning within five minutes or less usually there is like a long processing noise, like something is uploading - the computer is waking up all its programs, etc. I have a question about the times where you are just on a website and you hear something similar and you are not even clicking on something or doing anything, just reading for a while. Why would the computer make a processing sound when there is nothing to process? It's not the fans either. I was thinking it was the popup blocker working, but I've been on websites like wikipedia that have no popups and I've heard that sound. I looked on the internet and couldn't find anything. Thanks!