You should install FC2 tomorrow and get the xorg fglrx patches.
You get the 2.6.5 kernel with agpgart compiled in. Check out the following thread, the 5th post down has instructions and patches (for FC2T3 but I think they should work in FC2 too):
If you want to stick with your FC1, I don't know what could have happened to your radeon.o but you should probably reinstall the kernel RPM with
rpm -ivh --force kernel-*.rpm
or rebuild the modules from the kernel-source. When you install the fglrx rpm, use --replace-files because it replaces a few files used by Mesa3D. Also watch the messages to make sure it was installed correctly. Sometimes you need to go into /lib/modules/fglrx/build_mod and rebuild and reinstall the module for your kernel. Also make sure to tell fglrxconfig to use the external agpgart and always load agpgart.o before fglrx.o.