runlevel problems, gdm doesn't start on bootup

[AlmostReadytoFly]

I'm running Debian sarge with gdm and kde.
A while ago I tried to install kdm (as I thought having kdm and kde would be sensible), after giving it up as a bad job, I set gdm back to default.
However, the display manager no longer starts automatically on bootup, and I'd like it to. I've changed the default runlevel back to 5 in inittab, but to no effect. Using advice from the intro to runlevels on the debian site I searched the /etc/rc*.d directories and found that there are no s99gdm scripts in any runlevel

sjoh1831:/etc# ls -la rc*d/*gdm*
lrwxrwxrwx 1 root root 13 Feb 21 11:32 rc0.d/K00gdm -> ../init.d/gdm
lrwxrwxrwx 1 root root 13 Feb 21 11:32 rc1.d/K00gdm -> ../init.d/gdm
lrwxrwxrwx 1 root root 13 Feb 21 11:32 rc2.d/K00gdm -> ../init.d/gdm
lrwxrwxrwx 1 root root 13 Feb 21 11:32 rc3.d/K00gdm -> ../init.d/gdm
lrwxrwxrwx 1 root root 13 Feb 21 11:32 rc4.d/K00gdm -> ../init.d/gdm
lrwxrwxrwx 1 root root 13 Feb 21 11:32 rc5.d/K00gdm -> ../init.d/gdm
lrwxrwxrwx 1 root root 13 Feb 21 11:32 rc6.d/K00gdm -> ../init.d/gdm

Can anyone suggest what I need to do next please? At the moment I'm having to login as root, start gdm, then login at the graphical login manager as myself (and I don't even know if that's a bad idea)

[Zelmo]

When you changed back to gdm after trying kdm, did you do so through dpkg-reconfigure?
Either

# dpkg-reconfigure gdm

or

# dpkg-reconfigure kdm

will take you through the same step of choosing your default display manager, and should set up the runlevel scripts accordingly.

[farslayer]

sysv-rc-conf

Check the runlevels you wish gdm to start in.. Debian boots and starts everything in run level 2 by default