I have a 13" MacBook Pro from Mid-2009 and just today I've noticed a real faint clicking noise coming from the fan. It almost sounds like that noise a bike makes when you put a baseball card against its wheel. It's not very loud, but when I'm working in a silent room, it's been pretty annoying. I opened the back and blew all the dust out and all that, but the problem seems to only have gotten worse since then. Any suggestions to what I should do? Edit: The fan is still spinning at its usual 2000rpm if that is any help.