I have a Denon AVR-4800 and have hooked up satellite box, CD player and DVD. The system was working prior to the DVD install. Now the audio doesn't work. No sound on TV (do have picture), no sound on FM, and no sound on CD player. Have checked the connections over and over. I'm stumped. Is there a reset or something that simple. ?

SOURCE: how to connect using a LCD monitor, cable box, DVD player

You won't need the VCR, that's only used for a cable box, and since you have one now there is no need. You'll want to connect everything with the better video plugin possible. Composite (red, white, yellow) is the worst, then s-video, then component (red, blue, green), then DVI, then HDMI. That will square your video. Then send all audio signals to the Denon. These cables are usually the red and white cables. OR Plug everything into the Denon to the appropriate input. Then connect the monitor to the video out of the Denon.

SOURCE: Denon AVR-4800 5.1Channel Standby light blinking

It's going into protect. Unhook ALL the speakers and see if it still shuts itself off. If so, then it will have to be taken in for service.

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You can also use a digital coax cable (color orange) to go into coax 1 for DVD coax 2 for cable box. Just make sure to set the coax in input settings. The coax cables are a little cheaper than the optical cables and work just as well.

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Is the sub woolfer out powered? My sub woolfer is not

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Make sure you have an anteena connected and adjusted