When I play movies while connecting my mid 2010 macbook pro to my projector using a mini display to VGA. Since my projector does not have an audio output I also run an aux cable splitting to my beats by dre beatbox and a speaker system. I stream the movies from my time capsule and play them through my mbp. The problem is when I am playing these videos I can pick up a static/apparent am radio station coming through my speakers. I cannot figure out what could be causing the problem but i believe that it has something to do with my macbook even though I can't figure it out. I have used different mbp's and this issue does not occur. This issue also occurs only when I am using the projector setup as well. I have tried plugging in headphones as well as playing the audio out of my speakers and this issue did not occur. I have also tried playing the media with both VLC and quicktime and the radio still plays. Since the events have started, I have ran a clean install of mountain lion and the problem is still there. I have no idea what could be causing the issue. any help is greatly appreciated.