try 'nomodeset' and 'radeon.modeset=0' with the recovery option in grub, a bit later select to use the low resolution for the current session and then, when you are in gnome, install the ati proprietary hardware driver. after that, everything worked fine for me.
try 'nomodeset' and 'radeon.modeset=0' with the recovery option in grub, a bit later select to use the low resolution for the current session and then, when you are in gnome, install the ati proprietary hardware driver. after that, everything worked fine for me.