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Forget the TV for now. If you're getting no sound out of the receiver to either speakers or headphones that indicates an issue of some sort with the receiver. You need to establish once and for all that the receiver's audio amplifier is either working or not. Assuming you have speakers hooked up...

Sounds like the output stages are shot - both amplifier and HDMI.

Did you plug in a pair of headphones to the Marantz and confirm that the audio section, at least, is working? Use the radio as a test.