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This question does beg for more details. For instance, some HDTVs have an optical out which can be hooked into the Denon. This works great when the unit doesn't have HDMI I/O. I have one such Denon unit  which I bought for that exact purpose. It's all I could afford, and it works. You do have to have the rcvr set on TV or whatever the optical in goes to.
Or, some people have a newer Denon and setup their RCVR to switch and only one TV input from the RCVR. then it's the cable box connection you need to check/switch to. it's not simple, but it's not that hard either. I you need more help you can PM me.
It sounds like the sub has an auto power mode, hence why it switches to red (off), so your system will not detect it. If there is any control to switch it on all the time do so and try it again. It must be green all the time during the test.
Sounds like a speaker wire is shorting against either another speaker wire or something metallic. Check your speaker wires to make sure they're not shorting (touching). If that doesn't work, I'd take it to a repair facility. Good luck!
This unit is in what is termed :protect mode". This means that one or more of the amplifier channels has a rpoblem that was detected by the protection circuit inside and the unit has been shutdown to prevent further damage. This is often shorted output transistors or a defective amp pac for the surround channels. Expect a parts cost in the $50 range for this repair.
This unit upconverts all video inputs to component output, so connect all your devices to your denon audio and video inputs and component video out of the denon to the tv component in and all should work fine
You need to check your speaker wire connections at the speakers and at the amplifier. You must have a positve and negative speaker wires touching. If you check them and still same result you need to unhook all speakers from amp and speakers and hook up one speaker at a time to see if you get message for each speaker and when you finally do you will know which speaker wire and speaker is giving you a problem.