[ubuntu] Urgent help needed... Computer crashes when i quit..

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http://ubuntuforums.org – Alright recently i installed a graphics card.. a radeon 9200.. and this seems to be the problem.. my xorg is mostly default except for the following.. Section "Device" Identifier "radeon 9200" Driver "ati" BusID "PCI:0:8:0" OK everything works fine at first.. i edited the xorg from a failsafe terminal.. then i startx... gnome comes up everything works great... When i hit quit and try to shutdown.. the computer crashes.. and it gives me the error pll1 reverting ? somthing of the sort i cant troubleshoot right now im not at the computer.. and returns me to a terminal.. if i startx everything works fine again! But if i reboot.. my xorg gets reverted... or should i say corrupted? its not the regular backup its like 3 lines long with nothing really on it... i have to redit the xorg to log back on... Any help? (Hardware)