[[!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)'."]]
Make sure that the Boot Menu key is enabled, in your BIOS or UEFI options.This option might be called **Boot Device List** or something similar, depending on the computer.
Enable **Legacy Boot**, in addition to UEFI.The computer might not start anymore on its regular operating system if you disable UEFI completely or if you only enable Legacy boot.