Lost S-Video Output

I have been using a G4 Powerbook 17-inch, 1.33 Ghz connected to an NEC VT470 LCD Projector through the S-Video output (Mirroring). It had been working just fine until recently - the s-video output stopped working. The odd part of this is that if I connect through composite video and the s-video to composite adaptor,It works. I have confirmed that the s-video input of the projector works, and i've tried the same thing on a 52" DLP rear-projection TV with the same results - composite video through the composite adaptor but no s-video straight through the s-video output. This makes me wonder if there's just a setting that's been changed or turned off. Another note: the Powerbook will not "detect" the projector when connected through s-video, but it does when using composite through the adaptor. Any ideas?

That does sound like a faulty video card - I just read another post regarding faulty video card - in that case replaced under warraty by Apple.

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