You’ll see the complete contents of your NVRAM.ĭon’t expect this to make for great reading. Your NVRAM should be reset.Ĭurious about what’s actually in your NVRAM? Open up the Terminal in macOS, which you’ll find in Applications > Utilities.
Instead, just hit the keyboard shortcut right after turning on the Mac, then hold those keys for 20 seconds. Apple killed their classic startup sound, so you won’t hear it.
#MAC KEYBOARD SHORTCUTS RESET PRAM PRO#
If you own a late 2016 MacBook Pro (and presumably other Macs made since then) things work a little differently. The NVRAM should be reset and your computer should start up normally. Feel free to let go of the keys when that happens. Eventually your Mac will restart, and you’ll hear the startup sound again. As soon as you hear the startup sound, press and hold the Command, Option, P, and R keys together. The first (and most reliable) method starts with shutting down your computer. If you want to reset your NVRAM, there are two main methods. 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. , 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. You won’t hear the iconic startup sound If you mute your Mac’s volume, then restart it, Let’s start by explaining what, exactly, NVRAM does.
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