Can't login to Ubuntu, it blinks Nvidia, and then login screen is back [closed]

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http://askubuntu.com – Possible Duplicate: Login screen won’t accept my password My computer crashed earlier this evening, I think it was somewhat overheated and shut itself down. After this, I can no longer log into Ubuntu. I can, however, login to a guest session. When I try to login to my account, there is some white text on black background flashing by, then the Nvidia logo blinks, then I am back at the login screen. When I've tried to start-up via the restore option, I finally get some message about no displays connected. I am running Ubuntu 12.04 32-bit on a Lenovo Thinkpad T410. (HowTos)