Boot Runner and FileVault

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TheBoot Runner selection screen operatesin front of the login windowafter startupbut before logging in. FileVault encryption allows the system to be unlocked before boot, but passes through the credentials after startup. When FileVault is enabled, the Boot Runner screen never appears because the user credentials used to unlockFileVault pass through to automatically log in to the user account. The solution is to disable automatic login for FileVault.

To disable automatic login, open a Terminal window and enter:

sudo defaults write /Library/Preferences/ DisableFDEAutoLogin -bool YES

To re-enable automatic login for FileVault, enter:
sudo defaults delete /Library/Preferences/ DisableFDEAutoLogin

For more details, see Apple Support Article 202842