X won't start

[Andy Van Hoof]

Hi,   i'm quite new to linux and i have an annoying problem...   i just reinstalled debian (stable 3.0) and used tasksel to select some packages, one of them the kde graphical environment.   after the installation i got some automated setup stuff, telling me to select my gfx card etc (it's a matrox productiva g100 agp), then i tried running startx and it crashed on me saying: no usable screens found   any ideas?   thanks for the help, andy