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I've looked at the threads here and tried everything. I'm running Windows Vista Premium on the PC, have a Sony LCD as monitor, and a brand new Yamaha RX-V667. The PC is running to the HDMI 2. Thought this would send audio too, but no. Thought problem might be HDMI not sending 2-way signal to monitor, so plugged in an optical connector between TV Optical Out and Receiver AV Optical In. Adjusted setup (on screen, very easy), but still nothing. Sound comes out from computer monitor speakers, but nothing from the receiver.

I went into sound setup on the PC and was able to get test tones from through the receiver using just the HDMI2 connection. So why doesn't recovered sound from the PC go to anything but the computer monitor?

Thanks for your help.