A couple days ago my MBP started making an odd noise, pretty much constantly. It comes from the left side, near the back. It sounds like either a fan or the hard drive, in case it is the HD I'll be backing up everything this afternoon. Unfortunately right now I'm a ways away from an Apple Store (about 45 minutes) and not near any repair centers either (I'm home from college in MD). What should I do? It wouldn't be the worst thing if I had to drive to the Apple store but I'd rather not do it for nothing.