I just purchased an ATV2, with the idea to stream videos and music from my imac to my TV. I have home sharing opened up on my imac and on the ATV2 but yet when I try and goto "my library" the ATV2 always says "not able to find itunes library". I have itunes on my the imac open and running, but nothing... Same thing happens with my iphone4 - the airplay doesn't seem to be working either. I'm on my home network - I can stream Netflix movies. What am I missing???