GDM -- How do I use it?

[Tim Lewis <tlewis digaudio com>]

Hello All:
Last night I tried using GDM.  I began by trying it from the command line.
It started up a teal screen, totally blank, and stopped there.  I read
through the gdm manual in /usr/doc/gdm and verified all was well against
that document.  Everything seems OK.  According to the manual, it seems to
stop at authentication, before putting up a login window.  I checked
/usr/var/gdm (??) and looked at the auth file and it had a short string
with my machine name and NO_MAGIC_COOKIE (or something like that.  BTW, I
did try it the traditional way from inittab as well.  Any help would be
appreciated.
Tim