OPEN GL & ATI RADEON

Hello

I have develloped a graphic engine in OpenGL with a video card Geforce 2 MX 400.

Now I have a ATI RADEON 9700 Pro and the latest drivers for it.

When I launch my motor, I have posting bug that I don’t have before. For example, I can see the edges of the skybox or the edges of the squares which composed my floor. My fug is also bugged.

What Can I do to result this bugs ?

Thanks !

PS : I uses OpenGL 1.2