Followed all related material to get the nvidia driivers installed / working. I have obviouslly missed something but have been banging away at this longer that I care to admit.
From the process list, it appears that startx worked but there is NOTHING on the display. It flickered a few times and thne nothing.
FC3 x86_64 + yumed all
removed the xorg Mesa GL packages
used several xorg.conf files I found
All produce the same result, it appears to be running but all I get is a blank screen.