If the graphics card in it is the one the machine shipped with, that's a special education-edition Power Mac G3 with the Rage Pro AV card instead of the Rage 128. In any case, those machines shipped with Mac OS 8.5.1-8.6, predating OS X by a long time, and don't have any support in OS X for the video functions of the card.
If that card is an upgrade, it could be a Rage 128 All-In-Wonder or similar, but again, there's no support for that in OS X as far as I know.
In fact, I doubt that even a stock Mac OS 8.6 or 9 disc has the drivers for the video inputs. I think you need the original discs.
tooki