I just got my iMac tues, today I had my studio monitor headphones plugged in with nothing playing, and I was getting faint but extremely annoying "ground noise" coming through. It went from highpitched wheeze to mechanical sound and back and forth while I was surfing web.....
Anyone else noticed this? Any cause/fix? I hope its not permanent, that would be pretty much unacceptable considering the audio work I do.....