I'm really not a UNIX guy... But here is my problem. With the exception of the root account all users when trying to log on get a black screen for a minute, and the the log on window comes back. Root logon with no problem. There are 2 servers tied together and the users log directly on to these servers. One user said this started after getting a Mentor Graphics database which he claims did a core dump. Are there user logon scripts with UNIX. Could this be the problem? Thanks to anyone that can help.

Check the login shell in the /etc/passwd file. Confirm that users have appropriate rights to that file. Check you /etc/profile, make sure you're not doing anything "funny" there. Check to see that you users have a home directory where they have appropriate file rights, if there's no home directory they may not be able to login. It's not much but it's a start, hope that helps.

Also check the users .profile or .bash_profile, confirm that there isn't anything wrong with that process. Good Luck!!