I have Denon POA 6600 and just bought a brand new Denon DVR 3400H receiver. I do not know the type of cables to connect to the receiver

Hello,

When the DISH Network installed hooked up their DVR, did they connect it via HDMI? If so, then it could be a bad HDMI connection. I would bet they simply bypassed your receiver and went straight to the TV, which is why no audio comes out of your receiver. You can test this by turning on your DVR and TV. If you see picture with your receiver OFF, then they bypassed your receiver. You'll need to hook up and HDMI cable from the DVR into the receiver and then out of the receiver to the TV.

try this...
http://www.eserviceinfo.com/index.php?what=search2&searchstring=denon+poa+800

You are correct. I feel your pain. This will not work.

HDMI is a pure digital signal and the providers require the content coming over the Dish DVR to be COPY PROTECTED. So it will not work unless the HDMI cable goes directly from the DVR to the TV. This is to stop people from being able to make their own recordings of Dish shows, or making copies of your DVR recordings. If you really want to run things through your reciver, you're going to have to use the "component" or "composite" video feeds, not the HDMI. Sorry.

Your'e losing digital data from Dish or the DVR. Since even live TV is through the DVR it is always a potential problem when anything glitches. That it doesn't repeat on immediate rewind/playback says the data made it to the hard drive ok.

The Denon is only defaulting back to an analog audio feed upon loss of the digital (preferred) one.

If it affects the video AND audio simultaneously the cause is something common to them.

I'd look at HDMI cabling into the Denon from the DVR.

Don't blame the Denon just yet.

My $.02:

I'd skip the video right past the Denon to the TV/Monitor even if it means using component cables instead of HDMI, but keep digital audio coming in from the DVR. Added cabling and connections never improve anything. Plus, HDMI cables are expensive.

It would be interesting to see if the problem comes back and affects only the audio or the video.

If you use optical cable make sure it has smooth flowing curves and no small-radius bends that would lose light power.

http://www.retrevo.com/support/Denon-AVR-3808CI-Receivers-manual/id/3124dj391/t/2/

make sure you are using a parallel analog cable if you have it connected with HDMI or a Digital audio cable. Digital signals do not get passed to zone 2...make sure analog cable is to the right DVR input on the Denon.

check the setting for the HDMI connection at the Denon you may have to assign the HDMI audio setting also on the front of the Denon while in the DVR mode press the input mode button on the front of the Denon to select auto and if that doesn;t give you sound you will have to connect a cable from the DVR optical.coaxial or analog audio output to the Denon and setup for that type of audio connection

Connect the HDMI outputs on your various components to the HDMI inputs on your receiver. Connect the HDMI output on the receiver to the input on your TV. HDMI incorporates digital audio, so no need to buy optical audio cables. If your receiver does not have HDMI inputs for all your components, you will need to make a choice. HDMI = Best, component video + optical audio = second best, S-video+ optical audio = third best

Denon AVR - 788
Code for DirecTV remote RC64
The code I have found for this one is 31360 and maybe 31104.

OK LOOKING AT THE SPECS FOR THE EXTENDER YOU DO NOT NEED TO WORRY ABOUT THE SERIAL CONNECTIONS, WHEN USING THE SERIAL CONNECTIONS YOU NEED RS232 CODE STRINGS TO CONTROL THE DENON OR ANYOTHER DEVICE THROUGH THIS EXTENDER USING THE RS232 CONNECTIONS.
IT LOOKS LIKE YOU CONNECT AN I/R EMITTER FROM AN MINI JACK I/R CONTROL PORT ON THE BACK AND THE OTHER END TO THE I/R WINDOW ON THE DENON

My only thought is to make sure there are no protective covers over the ends of the optic cable. They often come with plastic caps. Either that or you have a bad optic cable if neither the DVD or DVR work with that cable. Good luck!