I suspect this is a duplicate of bug #30284. attaching the /var/log/Xorg.0.log file might verify this. Also, is the card PCI-Express, and do you know if specifying the "radeon" driver in the xorg.conf file lets your run an X-windows environment?
I suspect this is a duplicate of bug #30284. attaching the /var/log/Xorg.0.log file might verify this. Also, is the card PCI-Express, and do you know if specifying the "radeon" driver in the xorg.conf file lets your run an X-windows environment?