I have tried to connect my Apple Airport Extreme Wired/Wireless router to my new Denon AVR-X4000 using an ethernet cable from one of the empty inputs on the back of the Apple router and the receiver keeps showing No Network connection. I have switched out my working Windows 7 Home Premium PC ethernet on both open inputs of the router and they light up and work so it is not the router inputs. ANyone else having similar issues - the Denon manual shows it to be a plug and play device but so far it does not work? I would appreciate any member input - am I missing something??? Thanks to all responders.