Essential support articles
Our advice may refer to the following features; check out the support articles linked below for full instructions.
macOS Recovery The Recovery system contains tools to help you look up info online when macOS won’t start, and to repair or reinstall the system. Learn more at bit.ly/mlrecovery.
Sa fe mode When you start your Mac in Safe mode, macOS performs extra checks and stops certain thirdparty software from running. See how to use it at bit.ly/mlsafemode.
Reset SMC &NVRAM These features handle low-level functions and store key settings for your Mac, respectively. Resetting them can fix various issues described at bit.ly/mlresetsmc and bit.ly/mlresetnvram.
Hardware issues Your Mac includes tools that check for certain hardware issues without going to a Genius Bar. For Macs introduced in June 2013 or later, see bit.ly/mldiag, otherwise see bit.ly/mlahwt.