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Hi there, sorry to hear you're having trouble with the Denon,
while it is rare, we do sometimes see faulty hdmi boards in these receivers.
It could also be an incorrect setting though.
The receiver is not worth repairing, so we should attempt to reset it and see if this can be corrected yourself.
I have been a Denon dealer/installer for over 10 years, and I can tell you with certainty that it would be cheaper to buy a new receiver than to get this one fixed (expect to spend $300+ on parts/labor, and be without your receiver for up to 2 months while it sits in the shop waiting on a hdmi board).
Lets first try a microprocessor reset:
power the receiver off, using the small on/off button (not the larger on/standby button)
then press and hold the Surround < and Surround > mode buttons, keep holding them while powering back on with the smaller on/off button, and hold them until the display starts flashing, then release.
If the problem persists after that, and you can't even get the denon on screen menu to display via hdmi, then you do indeed have a failed hdmi board.
At that point, you could pursue repairs (not recommended, replace the receiver (I can recommend some options, if you'd like to go that route), or what I would recommend to salvage the rest of the system, is a workaround connection:
hook everything up to your tv directly via hdmi, then run a separate optical cable from the digital audio out port on the tv back to the denon.
In this manner, the tv would control all of the inputs, and you'd always leave the denon set to TV mode (opt 1 port). This would give you full HD picture on the tv, as well as the same quality digital surround through the denon, without having to invest in repair or replacement of the receiver.