What Does Option Command P + R Do on a Mac? How to Reset NVRAM/PRAM

Learn how Option-Command-P-R resets NVRAM/PRAM on Mac to fix startup disk, volume, resolution & timezone issues easily.

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Option-Command-P-R on a Mac initiates a reset of the NVRAM or PRAM. This action can resolve issues related to startup disk selection, screen resolution, system volume, and time zone settings. To perform this reset, turn off your Mac, then turn it on and immediately press and hold these keys until your Mac restarts and you hear the startup sound for a second time. Release the keys after hearing the second startup sound.

FAQs & Answers

  1. What is the difference between NVRAM and PRAM on a Mac? NVRAM and PRAM store similar system settings such as volume, screen resolution, and startup disk. The terms are often used interchangeably in modern Macs, but NVRAM is a type of memory used in newer Mac models.
  2. When should I reset the NVRAM or PRAM on my Mac? You should reset NVRAM or PRAM if you experience issues with startup disk selection, screen resolution, audio volume, or incorrect time zone settings on your Mac.
  3. How do I know if the NVRAM reset was successful on my Mac? You’ll hear the Mac startup chime twice after holding Option-Command-P-R during startup, indicating the NVRAM or PRAM has been reset successfully.