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en	Make sure that you have installed Tails using either:

en	[[balenaEtcher from macOS|install/mac#etcher]]

en	[[balenaEtcher from Windows|install/windows#etcher]]

en	[[GNOME Disks from Linux|install/linux#install]]

en	[[the Linux command line|install/expert#install]]

en	Shut down the computer.

en	Shut down the computer while leaving the USB stick plugged in.

en	Plug in the other Tails USB stick that you want to install from.

en	Plug in your Tails USB stick.

en	Switch on the computer.

en	Immediately press-and-hold the Option key (⌥ or Alt key) when the startup sound is played.

en	Hold the key pressed until a list of possible startup disks appears.

en	[[!img install/inc/screenshots/mac_option_key.png link="no" alt="'Option' or 'alt' key in the bottom left of Mac keyboard"]]

en	Choose the USB stick and press Enter. The USB stick appears as an external hard disk and might be labeled EFI Boot or Windows like in the following screenshot:

en	[[!img install/inc/screenshots/mac_startup_usb.png link="no" alt="Screen with the logo of an internal hard disk labeled 'Macintosh HD' and an external hard disk labelled 'Windows' (selected)"]]

en	If the USB stick does not appear in the list of startup disks:

en	[[!inline pages="install/inc/steps/basic_troubleshooting.inline" raw="yes" sort="age"]]

en	If your computer still does not display the Boot Loader, it might currently be impossible to start Tails on your computer.

en	If your Mac displays the following error:

en	Security settings do not allow this Mac to use an external startup disk.

en	Then you have to change the settings of the of your Mac to authorize starting from Tails.

en	To open :

en	Turn on your Mac, then press and hold Command(⌘)+R immediately after you see the Apple logo. Your Mac starts up from macOS Recovery.

en	When you see the macOS <em>Utilities</em> window, choose <strong>Utilities&nbsp;▸ Startup Security Utility</strong> from the menu bar.

en	When you are asked to authenticate, click Enter macOS Password, then choose an administrator account and enter its password.

en	[[!img install/inc/screenshots/startup-security-utility.png link="no" alt="Startup Security Utility"]]

en	In the :

en	Choose No Security in the Secure Boot section.

en	Choose Allow booting from external media in the External Boot.

en	To still protect your Mac from starting on untrusted external media, you can set a firmware password, available on macOS Mountain Lion or later. A firmware password prevents users who do not have the password from starting up from any media other than the designated startup disk.

en	If you forget your firmware password you will require an in-person service appointment with an Apple Store or Apple Authorized Service Provider.

en	Read more on Apple Support about:

en	Startup Security Utility

en	How to set a firmware password on your Mac

en	If the computer starts on Tails, the Boot Loader appears and Tails starts automatically after 4 seconds.

en	[[!img install/inc/screenshots/grub.png class="screenshot" alt="Black screen ('GNU GRUB') with Tails logo and 3 options: 'Tails' and 'Tails (Troubleshooting Mode)' and 'Tails (External Hard Disk)'."]]

en	The Troubleshooting Mode entry disables some features of the Linux kernel and might work better on some computers. You can try this option if you think you are experiencing hardware compatibility errors while starting Tails.

en	The External Hard Disk entry makes it possible to [[start from an external hard disk|doc/advanced_topics/external_hard_disk]] and some [[problematic USB sticks|support/known_issues#problematic-usb-stick]].