I have an ATV generation 2 and 3 the 3 was working fine through my HDMI DVR port on the denon. All of sudden a week ago the ATV stopped showing on my TV. I have checked the assignments and they seem to be correct. I tried my generation 2 same problem. When I boot the ATV I can see the apple logo on my TV as it loads but then nothing. I have connected directly to the TV and it works fine. Any help would be appreciated.