I was fiddling with AirPlay to watch some NASA TV for the Curiosity landing and had to reboot my MBP and my ATV2 to get audio through the TV (it was just playing through the laptop speakers.) So a reboot fixed that problem, but when I turned Airplay back OFF, my laptop started making a buzzing noise through the speakers. I could mute it and turn down the volume, and system sounds were still present. Another reboot resolved the issue. Has anyone experienced this?