Okay, so in all my experience with the Mac I have never encountered this. Let me know if I'm crazy. I was was contacted by a friend who purchased a used Macbook Pro from a friend of his. He has discovered, however, that the Mac is requiring a 4-digit PIN to do ANYTHING! What's weird is that it does it right from startup. If he tries to boOt from anything (attempting to reformat the hard drive), it displays a lock. Has anyone seen this before!?! How would I bypass it without knowing what the PIN is!?!