I've owned my laptop for just over a year, and it is coming into the warm areas of the year where I live. I decided to blow some air through my laptop vents to try and dislodge any dirt/dust buildups. After I turned it back on, everything was working fine but I noticed a high pitched noise, coming from around my fan. Whenever the fans rpm increases, it tends to get louder. I at first thought it was coil whine, but people have pointed out there aren't any components in a fan that should cause this. Any ideas on what might have happened?