Turn on your Mac, then press and hold <strong>Command(⌘)+R</strong> immediately afteryou see the Apple logo. Your Mac starts up from <a href="https://support.apple.com/kb/HT201314">macOS Recovery</a>.
The <b>Troubleshooting Mode</b> 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.
The <b>External Hard Disk</b> 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]].