overture with ati radeon 9250 series

[gizmo27]

Hi,

I've got an ati radeon 9250 series graphic card : plugged on a 4x (32 bits) AGP port

and when I lauch Overture : the beginning is good but when I try to launch a saved game : when I'm in the game : the motion stops => black screen => return to the motion = > motion stops again => black screen, etc...

More I play Open Arena : it doesn't works : it shows on the screen "input signal out of range" and nothing.

More when I launch the task manager or the ati catalyst control center : at the end of a time : the text is not readable

Comes from my AGP port ?