I am Mac user and am using iMac from last six months. I like to listen songs on my iMac so sometime I used headphones for listening songs or sometime i listen on my internal speakers, but when I plug in my headphones into the iMac it start playing inside my headphones. If I want to listen songs through my internal speakers I always have to remove my headphones. Is there any way that I can listen songs through my internal speakers without removing my headphones. If anyone has solution for this issue, please reply me.