I have strange problem with my ATI x1950 pro AGP card and Linux with Catalyst 8.1 Linux drivers.

After successfully install of this driver and reboot my PC I always get a short white horizontal lines over the gdm screen. When I want to login and when system start to entering into GNOME, the system hung. Cursor stopped, trying to go into console (CTRL+ALT+F1) is unsuccessful and only what I can is hard reset PC.

This happened always (with cooled and warmed PC).

Can be a hardware failure of graphic card, or something else?!