![]() It won’t fix everything, but it doesn’t generally hurt to try-though you may need to reset your time zone, resolution, or other settings like that if you’re using custom ones. If you’re having trouble starting up your Mac, briefly seeing a question mark during boot, or finding that your Mac constantly boots from the wrong hard drive, clearing the NVRAM can help. This is all useful information for your system to have before it boots, but in some cases corrupt NVRAM can cause Mac glitches or even prevent macOS from starting. According to Apple’s official instructions, the NVRAM also stores things like screen resolution, time zone information, and, crucially, which hard drive to boot from. How does your Mac pull that off? Because volume settings are stored in the NVRAM, which the Mac’s firmware has access to even before macOS begins booting. If you mute your Mac’s volume, then restart it, you won’t hear the iconic startup sound. Click on the drop down beside ‘Kind’ and choose ‘Other’. Now press Command-F to open a new Finder window. Let’s start by explaining what, exactly, NVRAM does. Open the Finder and navigate to your Home folder (press Shift-command-H). ![]()
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