i bought a mac book from some one that came back from the united states and i am stuck with the mac bcos after 2-3 nonths i a prompt came up saying this laptop was stolen blah blah, and it shut down and restarted with a 6 digit pin which i dont know and it does not allow me do anytin at all cos its blocked with the pin page,i cant locate the person that sold the laptop to me, what do i do,i was thinking on reformating the hard disk by removing it from the system and formating it but i am kind of scared it wont work......plz any addition will b appreciated