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Make sure that you have installed Tails using either:
[[<i>balenaEtcher</i> from macOS|install/mac#etcher]]
[[<i>balenaEtcher</i> from Windows|install/windows#etcher]]
[[<i>GNOME Disks</i> from Linux|install/linux#install]]
[[the Linux command line|install/expert#install]]
Shut down the computer.
Plug in the other Tails USB stick that you want to install from.
Plug in your Tails USB stick.
Switch on the computer.
Immediately press-and-hold the <span class="keycap">Option</span> key (<span class="keycap">Alt</span> key) when the startup chime is played. <p class="mac mac-clone">Drücken und halten Sie sofort die Taste
<span class="keycap">Option</span> (<span class="keycap">Alt</span>-Taste), bis eine Liste der
Speichermedien, von denen gestartet werden kann, erscheint.</p>
Hold the key pressed until a list of possible startup disks appears.
[[!img install/inc/screenshots/mac_option_key.png link="no" alt="'Option' or 'alt' key in the bottom left of Mac keyboard"]] [[!img install/inc/screenshots/mac_option_key.png class="mac mac-clone" link="no"]]
Choose the USB stick and press <span class="keycap">Enter</span>. The USB stick appears as an external hard disk and might be labeled <span class="guilabel">EFI Boot</span> or <span class="guilabel">Windows</span> like in the following screenshot: <p class="mac mac-clone">Wählen Sie den USB-Stick aus und drücken Sie
<span class="keycap">Enter</span>. Der USB-Stick erscheint als externe Festplatte
und heißt möglicherweise <span class="guilabel">EFI Boot</span>
oder <span class="guilabel">Windows</span>, wie im folgenden Bildschirmfoto:</p>
[[!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)"]] [[!img install/inc/screenshots/mac_startup_usb.png class="mac mac-clone" link="no" alt="Bildschirm mit dem Logo einer internen Festplatte mit der Bezeichnung 'Macintosh HD' und einer externen Festplatte mit der
Bezeichnung 'Windows' (ausgewählt)"]]
If the USB stick does not appear in the list of startup disks:
[[!inline pages="install/inc/steps/basic_troubleshooting.inline" raw="yes" sort="age"]]
If your computer still does not display the Boot Loader, it might currently be impossible to start Tails on your computer.
If your Mac displays the following error:
Security settings do not allow this Mac to use an external startup disk.
Then you have to change the settings of the <em>Startup Security Utility</em> of your Mac to authorize starting from Tails.