I am trying to FaceTime from my MacPro 2009 running OSX 10.10.5 Everything seems fine. I can make & receive calls. The problem is I can hear the other person but they cannot hear me. I have tried multiple headsets with the same results. Wired, Bluetooth, USB. Currently I am using the Logitech - H390 USB Headset. It shows up in both the Output & Input panes of the Sound Preference panel in System Preferences. Still no success. I tried calling a couple of iPhones but no one can hear me. Am I doing something wrong? Any info would be much appreciated. Thank you.