Hi all, I purchased a 27" iMac back at the end of October 2011. It's the 2.8Ghz model. Over the past few days, I've noticed something inside the iMac is making a chirping sound. "chirp, chirp, chirp... chirp, chirp, chirp", and it doesn't seem to be stopping. And before the sarcastic results begin, it's highly unlikely that it's a bird on an insect. It's basically non-stop though. Sometimes it sounds more regular, sometimes irregular. My guess is a fan of some sort, but I'm really hoping it's not the hard drive. It seems to increase in frequency when I'm actively interacting with the computer, but even if I leave the room and come back, it still does it, so I'm kind of at a loss to say what it is. If anyone has any suggestions about what the problem might be, please let me know. I won't be used this upcoming week, but when I get back, if the sound still persists, I'm going to plan on calling Apple support and taking it in for servicing. It's starting to drive me insane. Thanks in advance to those to help.