Reply 22220 of 27550, by TrashPanda
At a guess I would think that it doesnt like the AGP slot, the Voodoo5 5500 really saw the AGP slot as a souped up PCI slot and thus didn't use much if any of the advanced AGP features and was limited to AGP 2x (Really 1x). Not even sure how its running on a more modern AGP slot but I'm guessing its a Universal slot, you might want to consider a different GPU and move that old girl back to a true AGP 2x board where it'll likely be happier.
But to answer your direct question, Yes its the Voodoo5 5500 its a picky bitch even when working correctly and is well known for having AGP issues/conflicts.