Hey i have a mac mini running OS X Yosemite and i recently purchased a logitech h150 headset with an analog connection i plug the cord with a picture of a headphone into the headphone jack and plug the cord with a picture of a mic into the other jack next to the headphone input. I go to system preferences and the headphone section works but when i go to the microphone section and speak into the mic the bar displaying how much audio its receiving doesn t move and ScreenCast-Omatic doesn t detect any microphones. How can i fix the mic??? Also on the little control buttons coming from the headset to the cord i have the mic off mute and the volume turned up all the way