Stuck in 640x480 on upgrade

[Alex Mandel]

I just did the upgrade from warty to hoary following the instructions on 

the web http://www.ubuntulinux.org/wiki/HoaryUpgradeNotes
Everything went fine, and I rebooted and the xserver seemed to work so I 
skipped the part about reconfiguring the xserver.

Upon shutdown and startup the next day I'm stuck with only one 
resolution 640x480 60 Hz(was 1024x768 80Hz prev.). So I ran sudo 
dpkg-reconfigure xserver-xorg and it ever setting seems fine so reboot 
and I still have no other options for my resolution in the 
(System->Pref->Resolution, on the default Gnome).

What happened, it was working and isn't now and I'll I did was a shutdown?

Thanks,
Alex