Another Infinite Login Loop Problem - need help badly

Hello. I need help.
When I start up my iMac (24 inch last generation model) I can't log into the OS. When I enter my password I see the default OS wallpaper (nothing else) then it kicks me to a blue screen then right back to the login. Same thing over and over. I've already ran disk utility off of the install CD to repair permissions, etc... but no luck. This even happens when I enter into safe mode. I'm running the latest version of the OS.
Can anyone help me?

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