I’ve had some weird issues for the last 2 months or so: I couldn’t use Skype at all. I could hear the person I was talking to, but they couldn’t hear me. The Audio & Video settings in Skype were showing me that the microphone wasn’t working, though it was working in basically all the other apps.
After testing everything I could think of, I looked for other solutions and here’s what worked for me:
My Macbookpro stopped allowing Skype to talk to my built in microphone.
To fix it – Go to System Preferences.
Go to Security and Privacy
Go to Privacy Tab
Scroll dow to Microphone – There you will see Sype pop up with a check box.
Check the box – It will suggest that you re-start Skype and offer to do it for you.
Restart Skype – your problem should be solved.
More context here.
Apple hardware is giving some headaches these days, so you can check this article as well: If your iPhone, iPad or iPod touch won’t turn on or is frozen