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Join Date: Jan 2001
Location: upstate NY
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The PCM light indicates what type of signal is coming from the selected input device, in this case, presumably from the Media box. The signal being PCM is controlled by the input device, not by the receiver. (See item #2 on page 5 of the receiver's manual.) In other words, check to make sure the Media box's settings didn't get changed.
You also should go through the receiver's "Input Setup" configuration to make sure the appropriate audio connection is enabled for the Media box. e.g. it might have been switched to the analog inputs which you don't have connected. See page 32 and later in the receiver's manual..
Marantz SR7009 avr + MM9000 amp --> Atmos 7.1.4
Fronts=NHT 2.9+AC2, FH+TM=DefTech PM1000, LCR+TM amped