I made changes in the single user mode - now my MacBook Pro does not boot anymore.

Hello apple support community,
I made changes in the single user mode and my MacBook Pro does now not boot anymore. It displays a grey bar and the "work in progress" wheel. My intention was to change my admin password following these steps:
http://www.macyourself.com/2009/08/03/how-to-reset-your-mac-os-x-password-withou t-an-installer-disc/
however, I have to admit that there was a typo sneaking in - oops!
Any idea how I can undo changes made in the single user mode?
Thanks in advance for your support - I hope I don't sound to nooby
Till

Hello, Till1234.  
Thank you for visiting Apple Support Communities.
Here is a troubleshooting article that I would recommend going through when experiencing this issue.
Mac OS X: Gray screen appears during startup
http://support.apple.com/kb/TS2570
Cheers,
Jason H.

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    - Signature: AirPort configd plug-in
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    - Result: Noop
    - Response time (ms): 3689

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