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Helpful answers
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Jul 4, 2012 12:47 PM in response to mskey236by BDAqua,Hello,
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.
And shows a big Lock if you use Option key to try.
If you can't contact the seller and get the login info/password, then...
Force Removing Password Protection
1) Add or remove DIMMs to change the total amount of RAM in the computer.
2) Then, the PRAM must be reset 3 times. (Command + Option + P + R).
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Jul 4, 2012 1:38 PM in response to mskey236by noondaywitch,A firmware locked purchase may well be stolen goods.