I need a real linux genious for this one :

When the X boot up screen is displayed, I try to log in as root. I type the password in and get a box that say 'authentication failed'. The weird part about this is, when I type in the wrong pass I get no box, only when I type in the correct pass. Also, I have another user on the same PC, when I type in his password I get the same box.

What has possibly gone wrong here!? The correct password won't let me into my system. If anyone has had this happen before please dear god help!

scat