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This wikiHow teaches you how to reset the NVRAM on your Mac computer. NVRAM is "nonvolatile random access memory" and it's used to store the settings for things like sound volume, display resolution, startup-disk selection, and time zone. If you're having issues with these or similar things, resetting the NVRAM can sometimes help. In older Macs, NVRAM was known as PRAM.
Steps
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1
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2Click Shut Down…. It's near the bottom of the Apple Menu. This will open a pop-up window.
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3Click Shut Down to confirm. It's in the bottom-right corner of the pop-up window.
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4Press the power button on your Mac. The power button is located behind the monitor on the left side or iMacs, and on the keyboard of MacBooks.
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5Immediately press and hold ⌘ Command+⌥ Option+P+R. Press these four buttons immediately after powering up and hold them while the computer boots up.
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6Release ⌘ Command+⌥ Option+P+R after you hear the startup chime a second time. Allow your Mac to boot up. You will have the option to check the startup disk, date and time, display resolution, and change the sounds.
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About This Article
1. Restart your Mac.
2. Press and hold Command+Option+P+R.
3. Hold until the startup chime sounds twice.
