no GDM after preupgrade from F14 -- help!

[Jason D. Clinton]

On Sat, May 14, 2011 at 21:51, Steven Stern
<subscribed-lists at sterndata.com> wrote:
> I ran pre-upgrade this afternoon on my F14 system.  Now, when booting
> it goes through the boot process. I can see it start the last thing in
> the init list, (Started Display Manager) the screen flashes a few
> times, then nothing. If I ALT-F2, I can login and see that gdm is
> running, but it's not visible.  Xorg logs show that the radeon driver
> is correctly selected.  The main screen is just the list of
> "Started...."
>
> Looking for suggestions before I restore from backup or try a clean install.

There's bound to be information about why the X server is dying in /var/log/gdm