Cannot log from console login

Hello All,
I'm facing the following problem:
On a specific server I have installed Red Hat ES 4.5 and everything seems ok.
But after a specific reboot, when the login prompt on the console, I put the root password and I can�t log on.

It is strange for me due to if y try to log on using SSH I can log in without problems.

Any suggest?

Thank you in advance.

Hello,
The problem was caused on PAM settings on file:
/etc/pam.d/login

Due to I have installed oracle 64 bits the line added by oracle was pointed to /lib
instead to /lib64

I changed the path and the problem disappear.

Hope this helps.