Output to an HDMI TV

Hello everyone,
I am wanting to connect my MacBook (Intel Core2 Duo 2Ghz) to my TV, a Pioneer PDP-434HDE (the actual box that all TV inputs are connected is the Pioneer PDP-R04E).
I have an Apple mini-DVI to DVI adapter, connected to a DVI-HDMI cable, which in turn is connected to the HDMI input of the PDP-R04E. The TV shows no image (just as if nothing was connected to the input) and the MacBook does not acknowledge the display; the Display System Preferences pane does not show it and it is not in the Displays menu bar item. The system profiler shows the 'Display Connector' as having 'No display connected'.
The thing is that I know what it should look like. The PDP-R04E also has a VGA input. I have an Apple mini-DVI to VGA adapter, which is connected to the PDP-R04E using a normal VGA cable. This works exactly as expected, with the PDP-R04E showing up in the Display System Preferences pane on its own window as well as being listed in the Displays menu bar item. The system profiler shows the PDP-R04E along with its technical details.
I am 100% sure the HDMI port on the TV is working as I can connect my DVD player and TV tuner to it okay. I am 100% sure that the mini-DVI port on the MacBook is working since I can use it to connect to the VGA input of the TV. The cable components have each been replaced at the Apple store several times, and I am fairly sure that they are not the source of the issue.
I desperately want to connect via HDMI because for reasons best known to themselves Pioneer put the VGA port at the front of the box (which is most unwieldy) while the HDMI port is sensibly at the back.
I have read through other people's DVI to HDMI issues and they are all lucky in that they are able to actually have their display recognised by the MacBook! So unfortunately they have been no help with my problem.
Any advice or tips would be gratefully received.

All I can tell you is what I experience. I connect as follows:
Macbook==> mini-DVI to DVI adapter ==> DVI to HDMI cable ==> Yamaha RX-V663 receiver HDMI in ==> HDMI cable out ==>Panasonic plasma
Once everything is on and the receiver properly switched to the right input and so on, my MacBook has no problem "seeing" the Panasonic and a panel for it shows up in Display Preferences along with the built-in "Color LCD".
If things get out of whack, and sometimes they do, it's because the Mac is detecting the RX-V663 as the display device and this will show up also in Display Preferences. The Mac sets a low resolution in this case and the image may not appear on the monitor. This may be what's going on in your case. Check Display Preferences and check video settings (ie. Are they different than the default?).
For me, the mismatch is easily cured by telling the Mac to "Detect Displays". This is the first menu choice on the menubar if you enable the "Show displays in menubar" in display preferences. The Mac will generally reconfigure as it finds the path all the way to the monitor. Unplugging and re-inserting the video adapter will accomplish the same thing.
If these don't work, the problem could be your Pioneer gear. On my Yamaha, specific inputs can be assigned to a specific menu choice. For instance "DVD" could be set up to accept component video from one of the component inputs and optical audio from one of the optical inputs. Or you could choose video over HDMI and audio over coaxial digital. There are any options, and the defaults are not always perfect for what you need to do. Maybe your Pioneer has something similar, and you just need to tell it what to do.

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