Unable to start up in "Single User Mode."

I am on an Intel Mac Pro. I can't seem to start up in the Single User Mode.
I hold down the Command and S keys during startup, but always get to my regular screen, logged in to my account. I changed the login options from automatic to off, but the same thing still happens. Any help would be appreciated.

Hi
Have you possibly set yourself a firmware password? Further instructions here:
http://support.apple.com/kb/ht1352
Tony

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