Xfree86: "no screens found" with default configuration

[John Christian <johnc909@comcast.net>]

I've installed the xfree86 packages plus gnome, and so far haven't 
touched /etc/X11/XF86Config-4 generated by debconf, but it's giving me 
the following error on startx:

fatal error: no screens found.

And I certainly have a 'Section "Screen"' in my config file.  I'm not 
sure what else it could mean.

Thanks,
-john