I have a 2010 11" Macbook Air, running OSX 10.8.2. Everything is great, except that the internal microphone suddenly stopped working. Could it be a setting that I don't know about, or is it a hardware problem? Could it be related to the OS upgarde? (I recently upgraded from Snow Leopard to Mountain Lion.) Also, as the internal mic is not working, I tried to use my Apple iPhone earbud mic as an external mic for my Macbook Air. But when I plug the earbuds in to the headphone jack, the mic is not recognised. The audio input still says "internal microphone", and no sound is recorded via the earbud mic. So, ideally, is there something I can do to get my internal mic working? Or how can I get the Macbook to recognise the earbud mic? Many thanks for your help, much appreciated. Mat.