when i plug headphones in, i hear whining and hissing. When I searched this on the forums, I find a few topics about processor whining, is that the problem I'm experiencing? Is there a solution to this issue? possibly purchasing a usb --> 3.5mm adaptor? Any help is appreciated ive only had this laptop for a week and its already driving me crazy. I have applecare, would going in to see a "genius" be of any use?