The sound you describe is usually a mechanical noise from the transformer/case work. Home theater amps tend to have quite large transformer in what is, due mainly to its size, a rattly cabinet.
Over time, the lamination inside the transformer can loosen which could explain why it has only just started doing.
Alternatively, one assumes you moved the amp when connecting the new kit? This may have let the case work rest in a new way which is proving susceptible to relaying the vibration caused by the transformer as an audible noise on switch on.
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This sounds to me as an issue not with your AVR but with your cable unit. I have seen this where there is a sample rate issue with the cable boxes. I would try to get another cable box, and see if the issue persists.
1 Your DSP board is toast. ( not much hope, it must be sent to Denon as they do not have anymore entire circuit boards for swap-out replacement.
2. Heres the hope part......Inside your denon is like a computer.....there is a main board, separated by the big silver heatsink, and then there another main board. On the main board closest to the volume control, the DSP boards and Video boards plug into the main board . The DSP and video boards are up and down ( when the receiver is laying flat, like normally ), and they plug into the main board from the top.
Denon is NOTORIOUS for bad solder joints and the little white connectors that connect the "motherboard" to the DSP and Video boards are of suspect quality ( the rest of the unit is great )....So it COULD be that you have a bad solder joint on one of the connectors or the connector itself. There is also another set of connectors that joins the front panel display to this "motherboard".....these colder connections are also suspect.
I would have a denon repair shop look at it as I GUARANTEE they have seen this before.......best of luck...Rob
Had same problem with this reciever over the weekend. I had to hook up a TV to the COMPOSITE monitor jack and then I could see the menus. I could never get it to show the menu over the component outputs, however a DVD player hooked up played perfectly. Anyone have a solution?