Pretty much after having my mini display port to hdmi hooked up and trying to get the resolution of my tv (720p) to show the whole screen without being cut off (annoying in itself) found this: Buzzing whenever I have my speakers plugged into my headphone jack and I then also plug in the mini display port to hdmi. Changing the volume of the OS does not change the volume of the buzzing whatsoever. I can put the jack back in and take the mini port cord out, and the buzzing stops. Put the mini port back in, and buzzing commences. What could be the problem? This is a 18 hour old macbook pro, brand new shipped earlier yesterday.