Watching that while taking apart my iMac -when I upgraded the hard disk to a 2TB one a few months ago (and a very good idea that was) I accidentally disconnected the microphone cable. Fiddly little connector which wouldn't stay attached. Doing that again today took an hour and a half of my life. Seems to be working now, though.
Ok, maybe off to the gym, I think I have time to do this before next lesson.
What a lovely sunny day!