My MacBook Pro is now asking for a login. When I enter my passcode, it goes to a blue screen and back to the login screen. I saw several older posts, but nothing recently. I am running Snow Leopard.

My MacBook is now asking for a password. When I login, it loops to a blue screen, and back to the login. Incorrect logins create a shaking of the login screen. I tried restarting with the shift key depressed, with no luck.

I performed a hard shutdown, and upon start I could access my system without logging on. I'm not sure what caused the issue, but I have not booted up in almost a week.

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