I have been beating my head around for this. One of my play buttons on the left decks was sticking a bit. I did not think it was that much of a deal, because the controller was still powering on.
Now, out of nowhere, The only thing I get on the unit is the standby light. And as it blinks, I hear a clicking noise.
I tried switching the on/off switch for the standby, and hitting the reset, but no go.
Denon phone support said the unit was so old they had no info. on it.