I'm also ressurecting this post in hope of help!
I purchased a Pioneer TV with PDP-R04E media receiver and can't get the HDMI port to function. Again, my bluray player works on other TVs. I also had the HDMI option in the menu greyed out, but figured out that I had to have the TV on Input 3 before the option became active. I then enabled HDMI, but alas my tv still shows no picture.
This really annoys me as I purchased this in 2003 at a cost of nearly 4 grand, didn't use the HDMI until now and then it doesn't even work. Very, very dissapointing.
Did you find any solution?