PCM light flashes continuously

Marantz SR 7300 It cycles through all the settings Prologic- stadium -cd/ digi1-stereo-movie - prologic etc. There is no sound unless it randomly stays on the right setting and a few seconds later it goes through the same cycle again. How can i fix this?

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Larry G what is the history on this? Did this just all of a sudden start or did anything happen to it. How did you connect the input? I believe PCM looks for digital input only.

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