It could be but it could also just be hung up internally. These new receivers are like computers and sometimes act funny until you "Reset" them.
So, you need to try a microprocessor rest. The owners manual will explain how to in the trouble shooting guide. If you need the owners manuel download it here.
http://usa.denon.com/US/Downloads/Pa...ionManual.aspx
Look specifically for "Microprocessor reset" and do what it says. Usually a combo of buttons to hit...
Just know that YOU WILL LOSE ALL OF YOUR SETTINGS and Audyssy Calibration.
If that doesn't work check your reciept. The warranty is 2 years from date of purchace.
Good luck!