Switch on the computer and iImmediately press-and-hold the <span class="keycap">Option</span> key (<span class="keycap">Alt</span> key) until a list of possible startup disks appears⌥</span> or <span class="keycap">Alt</span> key) when the startup sound is played.
Immediately press-and-hold the <span class="keycap">Option</span> key (<span class="keycap">⌥</span> or <span class="keycap">Alt</span> key) when the startup sound is played.
24
Turn on your Mac, then press and hold <strong>Command(⌘)+R</strong> immediately after you see the Apple logo. Your Mac starts up from <a href="https://support.apple.com/kb/HT201314">macOS Recovery</a>.
Turn on your Mac, then press and hold <strong>Command(⌘)+R</strong> immediately after you see the Apple logo. Your Mac starts up from <a href="https://support.apple.com/kb/HT201314">macOS Recovery</a>.
25
When you see the macOS <em>Utilities</em> window, choose <strong>Utilities ▸ Startup Security Utility</strong> from the menu bar.
When you see the macOS <em>Utilities</em> window, choose <strong>Utilities ▸ Startup Security Utility</strong> from the menu bar.
37
[[!img install/inc/screenshots/grub.png link="noclass="screenshot" alt="Black screen ('GNU GRUB') with Tails logo and 23 options: 'Tails' and 'Tails (Troubleshooting Mode)' and 'Tails (External Hard Disk)'."]]
[[!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)'."]]
