I developed a very odd problem yesterday, after having bought my appletv a few days ago. Suddenly, the optical audio out didn't work for almost all of my audio and video files (from various macs). When I hook it up via HDMI, everything works perfectly fine. I know it's not my toslink cable or other hardware for 2 reasons: 1) The audio works FINE on the appleTV intro sequence as well as my Handbraked movies. All of my music and TV shows, however, are totally silent, as are the sound effects on menu navigation (this is despite having the sound effects set to 'on.'). Keep in mind that, prior to yesterday, all of these currently-silent files worked fine. 2) I've changed out the cable 4 times with thoroughly functional toslink cables, and have used the optical ports on my other components without difficulty. In terms of why I would need toslink if HDMI works fine -- this appleTV is for a room that has a TV with no HDMI inputs. I have no need for it in my other 3 main rooms, which all have other media servers or HTPC's. Has anyone else experienced this? I think I'm gonna end up needing to return this thing. I really didn't want to have to get a 3rd ps3 for media streaming, as it's still a clunky interface with compatibility issues. But this problem is frustrating beyond belief.