I now have a microphone specific question. As you can probably guess, that question is: how do you turn off the Internal Microphone in these new iMacs? I use to run Tiger (what a leap it's been from Tiger to Mountain Lion, I can tell you!) - and on that OS, it seemed to me that the microphone was only on when the mic icon was floating on the desktop. Was I right in that belief? And if that's the case, why is it switched on by default now? I've tried to research the answer to this question, but it looks like I'm the only person asking it Thanks SO much to anyone who can give me an answer - I just find it really weird/pointless that it's there, sensing every stupid little sound in the room.