How to Clear the PRAM on a Locked Mac
Parameter Random Access Memory on a Mac is equivalent to the Non-Volatile RAM that PCs use to store basic information about the computer's hardware configuration settings, such as the amount of memory installed in the computer system. Occasionally the PRAM on a Mac gets corrupted, which can cause many different small problems with the computer, including random lockups. You can clear the PRAM on a locked Mac to reset the stored settings back to their factory defaults.
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Instructions
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Power off the Mac. If the computer is locked and unresponsive hold in the power button until the computer turns off.
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Power on the computer.
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Press and hold the "Command," "Option," "P" and "R" keys immediately.
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Continue to hold the keys until the computer restarts. It is optional but recommended practice to continue holding the keys until the computer restarts for a third time.
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Release the held keys.
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