A thank you to all who replied regarding this problem.

Solution: Unknown.
Best guess:
Updated 3dfx oem drivers with x3dxf Voodoolizer driver pkg
(3rd party), completed install and successful.
In device mgr, device name 3dfx Voodoo is now 3dfx interactive,inc.
Voodoo32000.
Removed the disabled vga monitor & pci-vga graphics adapter from
device manager, restarted.
New hardware detected, display adapter, strong-arm installed voodoo
32000, forced install of driver I selected ! Device manager now lists
2 of these adapters, 1 shows typical i/o values, several memory ranges
and irq 10, 2nd shows irq 10 and 2 memory ranges (lower than the other
adapter).
The Voodoo3/2000 does not support multiple monitors, does not have
flashable/upgradeable rom and the installed drivers are dated 1999.

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