Internal microphone not working on Macbook Air

The internal microphone on my Macbook Air isn't working. I was going to Skype a friend so I downloaded it onto my computer, but when we did Skype, she couldn't hear me. We tried FaceTime after and the same thing. I plugged in headphones and used the microphone from that.  I opened Photo Booth after because I was curious and it would record but there was no sound. It's a mid- 2012 model and currently running OS Mavericks. I've reset the PRAM and SMC and  nothing changed. I started it in safe mode and when I did, nothing was under Input settings. I just got this computer, but it was used. I don't know if it was working before this, as this was the first time messing around with it. It'll pick up if I tap right above the microphone, if that helps. I don't know if it could be Skype or Mavericks. My fear is that it's an hardware issue. Can anyone help?

I do (from your description) think it is hardware. You have reset the things that I would suggest to address a similar problem.
Barry

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