Command+Option+P+R: This resets the NVRAM. Command+Option+R: Starts up the internet version of Recovery mode, which works the same as regular Recovery mode, but is online.Ĩ. If you have problems with your hard drive, OS X Recovery allows you to restore your Mac from a backup, verify and repair your disc, check your internet connection, or reinstall OS X.ħ. Most average users will never need to use this as it’s meant for running OS X off a network instead of a hard drive or disc drive.Ħ. N or Option+N: Starts up from a Netboot server. Both are meant to help troubleshoot hardware issues.ĥ. D or Option+D: Starts the Apple Hardware Test on pre-2013 Macs or Apple Diagnostics on newer Macs. This is useful when you’re installing a new operating system.Ĥ. C: Boots from a bootable CD, DVD, or USB. If you need to boot from a hard drive different than your primary one, or you’re booting into Boot Camp, this is the key you push.ģ. Option: This loads up the startup manager where you can pick between different hard drives or discs to boot into. This helps you troubleshoot because it only loads the minimum necessary kernel extensions at boot then disables startup items, user-installed fonts, font caches, kernel caches, and other system cache files.Ģ.
All The Special Key Combinations That Change Your Mac'sĨ hours ago 1.
