How to Reset MacBook Memory
Like all computers, Apple's MacBook makes use of Random Access Memory chips for its moment-to-moment memory needs. However, these computers also contain another type of on-board memory known as NVRAM (nonvolatile RAM) that stores computer settings from use to use. Among others, NVRAM stores instructions for functions such as startup, monitor depth, configuration of the serial ports, and the alarm clock. You can reset the NVRAM chip by following a few steps.
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Instructions
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Shut down the MacBook by clicking the Apple Menu and clicking "Shut Down."
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2
Start the MacBook and immediately hold down the "Option," "Command," "R" and "P" keys.
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3
Release the keys when the MacBook restarts on its own.
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Tips & Warnings
It may help to memorize the location of the keys. You have only a few seconds to press them once you restart the computer, and you must press them all at the same time. If the Apple logo loads before you have them pressed, it is too late.
Apple says that after resetting your NVRAM, you may need to reconfigure your settings for speaker volume, screen resolution, startup disk selection and time zone information.
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