I have a Denon AVR-X1100W, and it worked with my cable/satellite and gaming system. However, when I try to use my Apple TV it almost never connects, the tv screen just stays black. When it does, it typically flickers out (both audio and video) and the entire connection is gone (tv doesn't recognize that the Denon is attached. i.e., I can't even access Denon settings, as I can when it uses the satellite input even when the satellite box is turned off). Often, there is only static on the screen instead of it being black. Sometimes the screen flashes green before disconnecting. The receiver has been checked with multiple generations of the Apple TV, multiple HDMI cables, and changing the input slot. All devices and cables worked fine when going directly from the Apple TV to the tv, and all ports on the Denon work with non-Apple TV devices. The Denon also flickers on the front screen where it says PCM DIG (PCM flickers more than DIG). Any advice on how to fix it?