Voodoo 3 xp black screen

[Anaximandros]

I dig up my old voodoo 3 (16mb) I install the Nfx Voodoo345 beta2 drivers and start my pc (my ati radeon 1600 512mb was in - system boot from pci first). The system recognized the voodoo at start up screen and the logo of win xp pro came up, and when it was time for the desktop to come up the screen went black.  I recover only with reset.
The system works perfectly with my ati card and also sees the Voodoo but when I start with the Voodoo card I face the same problem.
 I have the screen resolution at 800x600 16bit my system config. is:
amd 64b +3200, 1gb, ati radeon x1600pro 512mp,win xp pro, Viewsonic
VA703b monitor.
 Any help appreciated
 Thanks in advance

[benna]

The bios recognises correctly the voodoo, but windows is still using the ati as primary display.
Set into the BIOS the ati as primary, boot in windows and then switch to voodoo3

[Anaximandros]

Thanks for your help, after I make the Voodoo work from windows, it also started as primary from
the boot sequence of the windows
Thanks again