PB detects projector but not 20" Display

I'm having a strange problem when connecting my 15" PowerBook G4 Ti DVI to a new 20" Apple Cinema Display (ACD). When I first got the display, I was able to connect just fine for about 8 weeks. I went on a trip and since my return, the PB won't detect the display.
I took the PB to a Mac store and tried connecting to another 20" ACD... no luck. This lead me to believe that the PB display adapter was shot. However, I just tried to connect a Benq digital projector via VGA and the PB detects the projector without issue and works in both dual display and mirroring modes.
So far I have reset the PRAM, the NVRAM, and the PMU, but it didn't help.
I've also repaired permissions and repaired the disk (no errors found). Again, no luck.
Finally, I tried closing the lid on the PB and clicking the external mouse to see if I could force the PB to display to the external 20" ACD. The technique worked for the Benq projector, but failed for the ACD.
At this point, I'm not even sure how else to troubleshoot this issue, let alone fix it.
Anyone have any ideas what might be causing this? Could it be a corrupted driver? Is there any way to reload Apple display drivers without having to do a fresh OS install?
Your help is greatly appreciated!
15" PowerBook G4 Ti DVI Mac OS X (10.4.8) 20" Apple Cinema Display

Hi, Wesley. Is it possible that your monitor's DVI cable has been damaged? You've verified that your DVI port is good, and also that your DVI->VGA adapter (and of course the projector's VGA cable) are good. If the DVI cable is detachable from the monitor, I'd try a different one and see whether the results are better.
I took the PB to a Mac store and tried connecting to another 20" ACD... no luck. This lead me to believe that the PB display adapter was shot.
When you tested with the display in the store, were you using your own display cable or the store's? Why did that test, which failed, suggest to you that your display adapter was bad? It wasn't in use when you connected a DVI display to a DVI Powerbook, was it? What did the store staff say when your Powerbook failed to detect their display?
You do have a warranty and free phone support for the display; I think I'd go ahead and contact AppleCare about the problem and see whether someone there can help you. I see you've also posted in the Displays forum here; that was a good idea too.

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