PB G4 detects VGA projector but not 20" ACD

I'm having a strange problem when connecting my 15" PowerBook G4 Ti DVI to a new 20" 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 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 the 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)

I've got a similar problem, my 15" aluminium powwerbook 1.5ghz will not display an image on the external 20" alu cinema display when connecting using DVI.
Have reset pra, checked cables power, screen just stays blank!! The 20" display works fine in exactly the same situation when using my wifes 17" Macbook Pro
The powerbook feels the external monitor [laptop screen flashes when connecting cable] but will not detect it as a valid external monitor. Use all the time at work with an external 21" CRT and VGA adaptor.
I've searched these forums and seen a couple of people with same problem but no answer as yet.
Very frustrating!!!

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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.
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[URL=http://www.imagebam.com/image/1c38e2154579824][IMG]http://thumbnails48.imagebam.com/15458/1c38e2154579824.jpg[/IMG][/URL]
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