My fans have been sounding sickly. They're not mooing, or humming but more chugging/gurgling at times (not getting the HD noise mixed up). I've been letting them do their little noise for a while but this was just nuts! I had run down my battery and the Macbook was put into auto-hibernate. I plugged it into a power source and it started back up. Only problem was the fans were spinning faster and faster each second. It seemed like they were at full rev and were making a sound similar to a weed-eater (I know people like to exaggerate on teh internets, i'm for realz). IT WAS LOUD!!! Sounded like one of the ball bearings have gone out and it was rubbing big time. I yanked the power cord and pulled the battery and plugged it back in. The fans did it again! So I PRAMed it and it's back to normal for now. This thing is only 3-4 months old. I guess I'll need to turn this into the Apple store for repairs, yes?