ATI 9000 (Depth Test)

Hello everybody.

I have a problem with my ATI 9000 (mobile) on my Acer TravelMate 800. The simple depth test doesn’t work a all. The code used works perfectly on the other computers.
I have WinXp and I’m using GLUT.
I’ve tested with DirectX9. Always the same thing. It’s impossible to use the depth test The simple cube seems to be explosed.
Have someone an idea ?

Thanks a lot !