I believe this started when my laptop fell about 3 feet from my desk to my carpet. I have to have my laptop half off the desk for the fan to cool correctly, so that was the reason that it fell. Anyways, at the start if the laptop started making the sound I could sleep it and then turn it back on and the sound would go away. It would only start making the sound if I lightly tapped it on the left side of the laptop near the fan. However, it's getting worse and now almost is always making the sound. It is strange because it does not sound like the fan revving up or just running at a high speed but is like something is unbalanced. It's a massive pain to open it up (thanks HP). Any idea what the problem could be and what I could do to help fix it?