Headphone with mic not working in audio input
This headphone/headset that is equipped with a mic does not work properly when I connect it to the audio input opening. The headphone/headset is only equipped with one plug (is this the proper term?).
When I adjust the audio setting (apple icon--> System Preferences --> Sound --> select "Input" tab --> highlight " Line in; Audio line-in port") I can only hear sounds through the headphone but the mic portion does not pic up. If I hit the mic portion I see the bars move, that would indicate some sound being picked up. However, when I try to use the mic, through Mac Office Powerpoint 2010, the sound (if received through the mic) does not pick up.
Why is this happening? Do I need some extra external component for the microphone part of the headset to work or do something extra in the System Preference area? Please help because I need to complete this project A.S.A.P.
Thank you!
MacBook, Mac OS X (10.6.8)