The options do show up for 5.1 and 7.1 under my monitor, which is strange as it has no speakers. Check the receiver settings. If it is configured for stereo on that HDMI channel, that is all it will ...
I just ran a 35-foot HDMI cable from my desktop's video card to my new TV, extended the computer desktop to the TV (as a second monitor), and fired up Windows 7 Media Center. Then I noticed two things ...