It just can't be the inverter!!

So, I replaced the lcd on my 15" G4 because of the problem shown in this post:
http://discussions.apple.com/thread.jspa?threadID=2339043&tstart=0
Now that the new display is in, I'm getting a backlight failure. I can use the screen, I have full functionality, just no backlight. It can't be the inverter because the old inverter was fine, as you can see from the youtube clip in the link above. I hooked up the old display out of curiosity and it is black, too, and still has the lower third missing. What is freakin goin on, man!?

Ok, here's the updated scoop.
My 15" Aluminum Power PC G4 is running at 1.67 Ghz, 80GB, 512 of RAM, and I'm running OSX 10.4.11 I can't run the AHT 2.5 because the disc is scratched, most of pity.
First thing I'll say is that there were a few design discrepancies between the full display (hinges, case, and all) that I received and the one that came off of the machine. The main difference is the length of the lvds cable and the way the cable hooks into the airport card. This forced me to replace the actual LCD screen into the old framing.
I know what the inverter board and the LVDS cable are, and I am certain that the LVDS cables I have are working properly because I can see the desktop and everything if I shine the flashlight through and they both show the same thing on both displays (albeit, with the original, I'm missing the lower third of the screen).
I removed the inverter board while the display was running and nothing changed. I have two, so I replaced it...nothing. I know the original board was working before I replaced the LCD panel, and the new panel says it came with a working board. So either both could have failed or something else is wrong. There is one other small board inside the display housing next to the inverter board that I doubt would be a problem, but I don't know what it is. Here is a picture:
http://gallery.me.com/jeremyfreer#100008/IMG_0544&bgcolor=black
This is all I have for you gents at the moment. Hopefully it's enough to set me on a better path.

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