Icloud sent me an email notice confirming that my mac was locked, how can i unlock it

ICloud sent me an email confirming that my mac desktop computer was locked, how can i unlock it

It would be useful to know how it happened once things get back to normal, because they will.
Have you tried an adminstrator password?  If you have alllowed it to it will let you in through your Apple ID (Preferences Users and Groups).
Booting up from a recovery disk will allow you to get in...I think.
I once had a situation where I was asked for a pw which did not exist and I pressed "enter" and it worked.
http://support.apple.com/kb/HT1533

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