Multi monitor opengl game probs

[Supra]

After I get my second vid card and monitor enabled with all drivers installed and I go try to play Counter-strike in opengl, I get an error that says "Vid card doesn't support OpenGl". I've got a GeForce 2 Pro in my agp slot as my primary and a Voodoo 3 3000 in a pci slot 2 slots below the geforce(fan in between). Is it because one is made by nvidia and 3dfx and they secretly made them not compatible or is there something i could be doing wrong? I've used several different versions of the nvidia drivers on the geforce and last version of 3dfx's and x3dfx's drivers on the voodoo. Everything else works fine. Even D3D games work, they even let me choose what vid card to use but not in opengl. Any help is welcome

Sys specs:
Duron 750@1000
Epox 8kta3 mobo
256mb pc133
30gb ata100 WD

Never had any probs with either card when each are the only vid cards in the comp

 

[Mictlantecuhtli]

If I remember correctly HL has a bug in 3dfx GL driver; you have to move it from gldrv directory to the same directory where hl.exe is.