box 4-digit code to open iMac

I was working on a 24 "iMac which was bought in a pawn shop, and it opens with a box to 4 digits. Tried to boot with the disk installation of Snow Leopard, comes with 4-digit boxes. Tried to use the secure boot, 4 boxes of numbers. Tried the Warrior Disk USB drive, 4 boxes of numbers. Tried resetting the Pram, 4 boxes of numbers. Someone has any idea how to get through boxes 4-digit?

Anti-theft protection installed by find my Mac & the previous owner, the 4-digit code is sent to phone this user...

Enter your system lock access code to unlock the mac

OS X El Capitan: use find my Mac

Tags: Mac

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