I can't login my MacBook Pro, I know the password, but it does not enter. PS: I can't either boot my Mac.

I was with Lion on my MacBook Pro, I came back to Snow Leopard, The firs time I tried to login i fail, but I know my password.
To solve the problem I boot it with the Snow Leopard DVD, but I failed again (I tried many times, pressing C and restarting).

Fannar9,
which model MacBook Pro do you have, which version of OS X is installed on it, and have you enabled FileVault on your internal disk?

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