Make sure that the HDMI on the receiver is set to on. The Multi Ch IN is for using analog cables, such as those for using for SACD/DVD-A or the analog outputs from a another source. The HDMI cable alone will carry TRUE HD and all other sound formats. You will then see multi-channel pcm on the display on the receiver. Also have to make sure that player is set up properly. I don't have blu-ray so I don't know what settings it uses, but with my HD-DVD it needs to set up as PCM in the setup menu. Hope this helps.