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Make sure that your Mac is turned off. If you can't shut it down normally (by pressing the apple logo and then press shut down), press and hold its power button for up to 10 seconds, until your Mac turns off. (Every Mac has a power button. On laptop computers that have Touch ID, press and hold the Touch ID button.)
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Turn on your Mac, then immediately press and hold these four keys together: Option, Command, P, R.
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Release the keys after about 20 seconds, during which your Mac might appear to restart. For example, you might hear a startup sound more than once, or see the Apple logo more than once.
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When your Mac finishes starting up, you might need to adjust any system settings that were reset.
Ask FixBot
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congratulations you have Reset the non-volatile random-access memory (NVRAM) on your Intel Mac. This helps for clearing stored low-level system settings from memory and resets them to their default values. This action can help fix odd behavior with your display, sound, or startup disk.
