The settings stored in NVRAM depend on your Mac and the devices that you’re using with your Mac. Settings that can be stored in NVRAM include sound volume, display resolution, startup-disk selection, time zone, and recent kernel panic information. PRAM (Parameter RAM) stores similar information, and the steps for resetting NVRAM and PRAM are the same. NVRAM (nonvolatile random-access memory) is a small amount of memory that your Mac uses to store certain settings and access them quickly. You can also press and hold the power button for 5 seconds.
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