I just purchased a 2.4GHz Penryn MBP a week ago. Yesterday I plugged in my iPhone headphones and I heard the high pitched noises and the static. I also tried the Apple in ear headphones and the same thing. When I plugged in my Harman Kardon Sound Sticks II... same thing! I usually use the Sound Sticks hooked up to and Airport Express with Airtunes, so that is not to big a deal. The weird thing is I plugged in my old iPod headphones that came with my old third generation iPod and the noises were gone! The noises don't come out of the built in speakers, they sound fine, except for the popping noise that occurs whenever they have not been used in a bit and a sound comes out. I DJ at a local club and was using my significant others Macbook. But now I am nervous to try out the MBP . I don't want to have these sounds coming through the club system! It would be embarrassing! I'm just a little pissed about spending so much money to have a faulty system. My old PowerBook was perfect, not one problem! Is it worth it to exchange it? Or will the new one have the same problem? My current MBP has a perfect screen and no other problems. I don't want to exchange it and end up with a worse one.