Why pram reset

On Mac computers that play a startup sound, you can release the keys after the second startup sound. On Mac computers that have the Apple T2 Security Chip, you can release the keys after the Apple logo appears and disappears for the second time.

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Definitions by TechTerms. Tech Factor? Your repair repertoire should also include a couple of additional procedures that can occasionally eliminate otherwise inscrutable problems—zapping the NVRAM and resetting the SMC. The procedures here apply to Intel-based Macs.

For M1 Macs, try shutting down the computer, waiting for several seconds, and then boot it up. Back in the day, the standard list of quick fixes for random Mac ailments always included clearing the PRAM.

If the values in this memory got out of whack for one reason or another, your Mac might not start up correctly or might exhibit any of numerous odd behaviors afterward. NVRAM serves approximately the same purpose as PRAM, but instead of storing a dozen or more pieces of information, it now contains just a few: your selected startup disk, speaker volume, screen resolution, time zone, and—if your Mac has crashed recently—details of the last kernel panic.