HT3799 locked out at the log in window ?

i have recently installed Maverick on my late 2010 MB Air that is locked at the log in window . I have tried to enter Disk Utility with r-cmd but end up on a grey screen with a Pad-Lock and a request for my firmware p/w is there a default p/w ?

RockeyIV,
no, there isn’t a default firmware password; the default is to have no firmware password. If your MacBook Air has a firmware password, then someone set it up that way.

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