IBook to video projector

In the past I have connected my iBook G4 to a video projector with the video adapter cable using an RCA cord from the adapter to the "video in" of the projector. The projector automatically recognizes the input and it works.
The past two times I have tried to use the same set up, it will not work. The video is not recognized by the projector. It works fine with the VGA(?) connector, but we are using two laptops and one needs to be plugged in via the Video In port on the projector.
Am running 10.4.6. Don't know if any OSX software updates are the problem or not. (I only need to do this kind of connection occassionaly, so I don't really know when the problem began.)
Anyone have any ideas???
I've tried using an RCA to S video cord, but the projection is blurry.
Thanks
Rex
iBook G4, powerbook TiG4 Mac OS X (10.3.9)

I used to have a similar problem with any mac on my last hospital, it was weird, because the macs (about 25-30% of residents used macs there) didn't worked with the projector, and the Hospital's Vaios did worked on the same setting without a problem.
Finally I was able to track down the problem to a faulty cable that somehow the vaios could use, and the Macs couldn't (it was all twisted and it was very old). When we replaced the cable, every mac (and of course, every other computer) worked again with that projector.
My point is, you should check with another VGA cable, before blaming the video adapter or the videoport of the computer.
Good luck.

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