Mac os x mountain lion doesn't respond at login screen

Has anyone had this problem? When you start the imac you hear the tri tone, then up comes the login screen. I try to type my login password, but its like the keyboard is unplugged. Nothing happens. No keys or the mouse work. I cannot login.
Please help.
Thanks!

Assuming it is not a keyboard issue...
Try to safe boot by holding down the "shift" key after you turn the computer and keep it held until you see an apple logo, spinning gear and progress bar.  Using safe boot will take longer than a regular boot.
Then navigate to /Library/Prefrences/ and remove the com.apple.loginwindow.plist and lockfile.  For good measure you can remove the com.apple.loginwindow.plist from the ~/Library/Preferences/ folder as well.  Then restart the computer.  If neither of those work, go back into safe boot and enable automatic logon in the Users & Groups.

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