I have tried plugging various headsets into the microphone jack. The system does not recognize the mic however it does recognize the headphone portion of the device. I know that the mic works because I can use it with my desktop.
The "mic" jack is a line in jack . Microphones do not have enough output voltage to work in a line in jack. The Griffin iMic acepts low votage inputs and converts the sound to USB. A pre-amp or mixer does the same thing for a microphone.
I got a IMic from Griffin, plugged the headphone part of my headset into the back of the Mac and plugged the microphone part into the IMic then plugged the IMic into my USB port on my IMac keyboard but the mic still didn't work. Do I need to configure something to make this set up work out?