Re: Help installing ATI driver
all the recent releases of Catalyst are not compatible with the xorg-server version Fedora 17 uses. Catalyst 12.5 should be released soon. If not in this week, probably next week. Maybe it will be compatible with Fedora 17.
uninstall the proprietary driver, and use the default Radeon driver. From console you can uninstall it either via "aticonfig --uninstall" or via the file /usr/share/ati/fglrx-uninstall.sh (or /usr/share/amd/fglrx-uninstall, no idea if the directory is still called ati)
to boot into console mode, you can add 3 to the boot line of Fedora (when you see the grub menu select the Fedora 17 entry, press e to edit it; at the line where it says "linux /boot/vmlinuz...rhgb quiet" add 3, press F10 to boot)