I'm putting a voodoo 1 and 3 in the same system and I don't really understand what's happening. This is on Windows 98 SE, 440LX.

This is what I do in the following order:
Install V1 drivers
Install V3 drivers
Install any game
Copy over dll files from system to game folder if needed
Open game, V1 is engaged
Exit game and my monitor goes into idle mode. Signal check says 0.0khz... I hear the mechanical relay making its intended click when trying to switch back to 2d.

Before I put the voodoo 3 in the system the integrated rage 2 and voodoo 1 did not present this problem. I have the 3dfx orchid voodoo 1 and voodoo 3 2000 PCI. Both were tested working alone perfectly. The only problem is that I cannot switch back to 2d anymore.