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Mid 2012 model, A1278 / 2.5 GHz i5 or 2.9 GHz i7 processor.

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What to install before new os-x?

had to change hard-drive, but what do i do before installing os-x?

Efi-firmware?

Answer this question I have this problem too

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Why did you have to change the hard drive, exactly? Without this information changing the hard drive may do you no good because the problem may not be with the hard drive. And I suspect it isn't.

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Is it asking for the EFI firmware password ...is that the real question?

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Basically the owner of the machine has blocked you out.

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