Authentication failed @ login

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http://forums.fedoraforum.org – I screwed up. I had my buddy help me with the installation for f16, and he didn't use my name, he used another name of someone else he was helping out. I looked up how to change your username, it said to edit the /etc/passwd file. I knew this was bad, I always heard, "never do this." Well I did it... I was running XBMC and it crashed on me, when I brought the server back up, I try to log in with both my username and the old username, and I get authentication failed, for both accounts. When I try to pull up a terminal (alt+ctrl+f2) I get a black screen with a box on the bottom, that i (HowTos)