The click wasn't there originally, it's started about a week ago (I would say my iMac is about a month old). I checked the apple discussion boards about the problem, and it seems to be common (on the boards). My click is more to the bottom left, and is "plastic" in sound, it doesn't sound like a metal click, more like something hiting plastic. I read on one of the links that someone had their logic board replaced over it... should I contact applecare? I am not too worried, I just don't want my computer to die on me one day at random.