Hi thanks in advance I'm new here. So I got my first iMac and everything was awesome, except that whenever I plug in a headphone or speaker, there's this "bleeeee" noise (much like what you got from a radio). I found posts here about similar problems but couldn't find a solution. Any help ? P.S. I tried (as they suggested in other posts) plug my Mac and speaker to the same power outlet, nothing. I also tried unplug everything except Mac and try it with a headphone, still noise.