Linux Authentication Problem

Hi,
I have a Debian Etch box. Yesterday I changed some LDAP configuration but after that I replaced the LDAP client configuration with my old backups. Now I can' login to the system even with local root. The system says:

Insufficient credentials to access authentication data

I know it was a PAM error but how can I get rid of this problem and give back access to the root? (I can change my files via a liveCD)

Thanks in advance.

Did you get your problem fixed? It was probably a PAM misconfiguration, correct?

Yes, my problem solved.:b:
I booted up with Ubuntu LiveCD and changed the content of /etc/pam/sshd content (if I remember well):

UsePAM no

After that I restarted the system and logged on with root and changed the PAM settings.