What is PRAM or NVRAM? How to do a PRAM/NVRAM Reset?

PRAM or NVRAM stands for parameter random access memory or Non-Volatile RAM. PRAM or NVRAM essentially stores information about your Mac’s control settings and is powered by a battery to ensure that your settings remain the same even if you turn your computer off.Modern Macs no longer use PRAM; they instead use something called NVRAM (NV for non-volatile). 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.

Steps :
1.Shut down your Mac.
2.Press the Power Button, and as soon as you power up the laptop(no need to hold power button).
3.Hold down Command-Option-P-R. You have to make sure you get those keys pressed before the grey screen comes up or it won’t work.
4.Hold those keys down until your Mac reboots again and you hear the startup chime.
5.Let go of the keys and let your Mac reboot normally.

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Information Sources: YouTube and Google

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