PB no longer recognizes VGA connection to projector

I use my PowerBook with two different external displays. It works fine with the DVI connection to an external desktop monitor. It used to also work fine connecting to a classroom A/V system with a projector (using the DVI-VGA adaptor), but it has mostly (tho not entirely) quit being able to detect the classroom system. When I click on "Detect Displays," nothing changes, or my PB screen changes to a lower resolution as if it is the external monitor. Mirroring doesn't work either. After restarting it still didn't even work. It worked fine for three weeks, now it just doesn't seem to see the A/V projector system. Any ideas?

I have a hunch it may be the DVI-VGA adaptor (and I don't have another one I can test). Because the last time I was successful using the CPX-885/PowerWerks system, I got connected but had to tighten the screws of the adaptor a lot in order to keep the picture bright enough and not dimmed purple. (Tightening the screws in the other classrooms has not helped.)
Or I should upgrade to 10.4.

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