About the PRAM and NVRAM in macOS

In a macOS computer, the parameter RAM (PRAM) and non-volatile RAM (NVRAM) are small amounts of RAM that store certain settings. Turning off your computer's power does not clear PRAM and NVRAM; a battery or capacitor on the motherboard keeps them active.

The NVRAM or PRAM can become corrupt and cause problems on your computer. If you're experiencing problems you've been unable to troubleshoot, you can sometimes solve them by "zapping" (that is, resetting) the NVRAM or PRAM. For more, search Apple's Mac Support.

This is document acfn in the Knowledge Base.
Last modified on 2019-03-29 13:35:55.