HT201541: Update the software on your Mac
Learn about Update the software on your Mac
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May 25, 2012 12:36 PM in response to cansey162by BDAqua,Hello,
Do you have Firmware password protection in Mac OS X ...
http://support.apple.com/kb/HT1352
It would block usage of all the startup keys, like C, N, T, D, CMD+s, CMD+Option+p+r, CMD +v, Option, and Shift, as well as booting from anything but the Hard Drive.