I recently bought an ATV2 and I have home sharing enabled with my Mac Mini. I have been finding recently that if I have my Mini on and turn on the ATV2 (out of sleep mode), iTunes on my Mini opens up on its own and starts playing music by itself. In addition, I find when I turn off the ATV2 while the Mini is on, three Z's show up on my monitor and the computer goes into sleep mode. If the Mini is in sleep mode when I shut down the TV/Receiver/ATV2, the Mini wakes up. Can anybody tell me what is going on here and how to make it stop?