Have you tried the SVideo and RGB outputs? If the receiver is configured for a different output mode it's possible there may be nothing on the composite video output. In that case you'll need to use the other output, navigate into the setup menu and restore to Composite. Or as last resort you can use RS232 and DreamUp to Flash Erase and then reinstall.
It sounds like you've ruled that out though and are certain it's hardware related?
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