So I have a Macbook the white Unibody and my mic has stopped picking up my voice. I noticed it during Skype that no one could hear me. Thought it was my settings and checked that so I started to google it. My preferences under sound doesn't seem to help. The mic works it picks up my typing, moving, snapping my fingers but when I talk it barely registers. I can clic on things and the mic picks it up but voices won't come in. I noticed a recording I did was super quiet. What should I do?