macOS Recovery

Bringing Mac back

What does this error code mean?

> Apple’s error messages are usually quite good at telling you what’s wrong, but some of them are just mysterious numbers that don’t really tell you anything – especially with iPhone syncing and software updates. You can look up error codes and find out how to fix them at support.apple.com/en-gb/HT203174.

When should I start in Safe Mode, and how?

> Safe Mode can help you identify the cause of startup, app or performance problems by running your Mac with all non-essential services switched off. On an Intel Mac, press and hold ß on startup; on an M-series Mac, press and hold the power button and hold ß once you’ve selected your startup disk.

How do I use macOS Recovery?

> Recovery can repair disk problems or reinstall macOS. On an M-series Mac, choose

 > Shut Down and press and hold the power button until you see “Loading startup options”. Click Options > Continue. On an Intel Mac, click > Restart and press and hold ç+R until you see the startup screen.

When should I reinstall macOS, and how?

> Reinstalling macOS is the last resort when your other troubleshooting steps haven’t worked. Back up anything important (if possible) before you do it. On an M-powered Mac, press and hold the power button until you see startup options; on Intel, hold down ç+r, press power and don’t let go until you see the Apple logo.

What do I do if I suspect a hardware failure?

> There’s an app for that. Apple Diagnostics can test your Mac’s internal components. On an M-series Mac, press and hold the power button until you see the startup options; click Options and then ç+D. On an Intel Mac, start your Mac with

D held down. Release it when you see the progress bar.