Authentication Failed Dialog Box on Redhat 4.7

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http://www.unix.com – For some reason i cannot login using root or other accounts on my Linux system. When logging in at the main console it says "Authentication failed" in a dialog box with an OK button. The Linux system is Redhat 4.7. I've already checked /etc/pam.d/login, /etc/security/access.conf and /etc/securetty files but everything is correct. I have already checked if /etc/nologin file exists. I have accessed the files mentioned above using rescue mode. Can anyone help me for this? (HowTos)