It should work. Here's an FAQ on HDMI issues and a list of things to check near the bottom. What's the length and gauge of the HDMI cable? Did you try another cable? Try unplugging and replugging the cable a few times at both ends to ensure a good connection. You will also note that there is one point regarding Pioneer AVRs which indicates that they need to be turned on first. (Point 28)
http://www.digitalhome.ca/forum/showthread.php?t=71112
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http://www.digitalhome.ca/forum/showthread.php?t=71112
Here's a post useful for those new to the forum - FAQs, Search Tips, Optimization, etc:
http://www.digitalhome.ca/forum/showthread.php?t=57741