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I'd ask the same question in one of the AVS subforums.
It's probably not a hardware failure, but an HDMI handshake issue.
How is the cable box connected to the HT AVR/BDP? HDMI or coax? Is there a digital audio input connection available on the HT AVR/BDP, to run audio from the cable STB to the AVR?
With HDMI issues slowly being resolved since the introduction a few years ago, I wouldn't buy a used AVR. I would buy a new, cheap Denon, Onkyo, or Yamaha AVR, one that is networked (connected to your LAN, provides Pandora and access to your digital music files on your computers).
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