Try this:
1. Copy /etc/pam.d to /etc/pam.d.save 2. Delete all files in /etc/pam.d 3. Create vi /etc/pam.d/other with the following contents:
======================================= auth sufficient pam_permit.so account sufficient pam_permit.so password sufficient pam_permit.so session sufficient pam_permit.so =======================================
4. Attempt to log in