15 commands and alternative ways to run the system macOS

Learn what to do if the Mac does not work, it freezes during startup or an error.

1.Prinuditelnaya reboot

If Mac hung during operation and does not respond to requests to help force reboot. To execute it, press and hold the power button until your Mac screen turns off, and then turn on the computer as usual.

Attention! When this is turned off unsaved information in the application is likely to be lost.

2. Removing the removable media

Eject (⏏) or F12

During a Mac with an optical drive failure and disk inside the system can not successfully attempt to boot from it and hang. click ⏏ to extract media (Eject) or F12 on your keyboard, or click and hold the mouse button or trackpad.

3. Selecting a boot disk

Option (⌥)

If the Mac has more than one drive and boot from the default disk fails, you can call the dialog to select the boot disk and select the media manually. To do this, press and hold ⌥ (Option) right after turning on the computer.

4. Booting from a CD or DVD

C

Similarly, Mac command can be given to the disc loaded in the internal or external optical drive. In this case, press and hold the key on the keyboard C.

5. Download from server

⌥N (Option + N)

When the local-have a NetBoot server on which the boot image of the system, you can try running the Mac, using it. To do this, press and hold the combination ⌥N keys (Option + N).

On computers with a processor Apple T2 This method of loading is not working.

6. Running in disk mode

T

If your Mac does not want to run, you can translate it external disk mode, and copy your important files by connecting from another computer via the FireWire cable, the Thunderbolt or USB-C. To run in this mode, press and hold when the button T.

7. Running in verbose mode

⌘V (Command + V)

Default macOS does not display a detailed initiation protocol, showing a progress bar. If you have problems you can include a detailed protocol that will help you understand the error occurs at any stage loading. For this purpose, when the combination tap ⌘V (Command + V).

8. Starting in Safe Mode

⇧ (Shift)

When the Mac will not boot normally, it is necessary to try to start safe mode. It made the disk check, and only includes the basic components of the system that allows you to determine exactly what program or service is causing the error. press and hold ⇧ (Shift) to boot into safe mode.

9. single-user mode

⌘S (Command + S)

This mode starts the system in an even more truncated version - it is only available command line. Nevertheless, with the help of experts will be able to diagnose and fix errors if any. To run in single-user mode, press the combination of keys ⌘S (Command + S).

This mode works only macOS High Sierra and earlier versions.

10. Running diagnostics

D

macOS has built-in software for diagnostic equipment, which will help to identify hardware problems. To run the diagnostics, press and hold D.

11. Run network diagnostics

⌥D (Option + D)

If the boot drive is damaged, run a diagnostic test will not work. In such cases, help network diagnostics, allowing to run the test over the Internet. For this combination of press ⌥D (Option + D)

12. recovery mode

⌘R (Command + R)

When you boot into rescue mode, you can access Disk Utility, reinstall MacOS, and restore data from backup. To enter into recovery mode, press and hold the combination ⌘R (Command + R).

If your Mac is installed firmware password, you must enter it.

13. Network recovery mode

⌥⌘R (Option + Command + R)

Similar to the previous regime, which in the presence of the internet allows you to reinstall MacOS, download the distribution system directly from the Apple servers. To use it, click ⌥⌘R (Option + Command + R).

14. Reset the NVRAM and PRAM

⌥⌘PR (Option + Command + P + R)

If a problem occurs with a display, speakers, cooling fans and other components can Mac try to solve them with the reset memory NVRAM or PRAM. To do so, press the start key ⌥⌘PR (Option + Command + P + R).

If you set a password on the Mac firmware, this method does not work.

15. Resetting the SMC

A more radical method reset - Returns the standard data system management controller (SMC). It is used if the previous method does not help. Depending on the model of Mac SMC reset is performed in different ways.

On desktops you need to turn off the Mac, unplug the power cord and wait 15 seconds. After that, reconnect the cable, wait five seconds and press the power button to turn on.

On laptops with removable battery you must turn off the Mac, remove the battery and then press and hold the power button for five seconds. After that, it is necessary to replace the battery and press the button to activate.

On laptops with non-removable battery you need to shut down your Mac while the power button and hold it for ten seconds buttons Shift + Command + Option. After that, release all keys and press the power button to turn on.

On the MacBook Pro with Touch ID sensor button is also the power button.