![]() Sometimes, as a last-ditch effort, you need to boot in Recovery Mode, and either repair a disk or (NOOOOO!) reinstall macOS. You may have to go back into System Preferences and adjust settings like volume and display resolution to your liking since they get reset when you reset the NVRAM. If you have a Mac that plays a startup chime, you can release the keys after you heard it a second time. Release the keys after about 20 seconds. ![]() Start or restart your Mac and immediately press and hold command-option-P-R on your keyboard.How to reset the NVRAM and PRAM on your Mac If you're having a complicated issue with your Mac, this is an excellent place to start. This is a small amount of memory that your Mac uses to store settings that it wants to access quickly. One of the first fixes you'll find on any forum is resetting the NVRAM (nonvolatile random-access memory). It can be any random issue from iCloud not allowing you to sign in to certain apps just not opening. Sometimes specific processes on your Mac just don't work. ![]() Reset the NVRAM and PRAM: option-command-P-R
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