I can name that tune in one word.
As I've stated many, many times before. The 08, and 09 units have severe HDMI issues. If 100% certain that you have everything connected correctly, then I'm 100% certain that it's the Onkyo.
The only thing you can do, is to check that the HDMI settinig is set to "through".
If it is, tell the customer to get a Denon, or send the Onkyo in for service.
Allegedly, Onkyo has seen the error of their ways, and has corrected the issue with the new models. I don't have the balls to find out.
Just in case you'd like to read my rant.[Link: remotecentral.com]