Black Screen Issue | Secondary Mac

If your secondary Mac shows a black screen when using Luna Display, follow these steps to fix the issue.

When to use this workaround:

  • The Luna logo does not appear when launching Luna Secondary.
  • You see a completely black screen on the secondary Mac.
  • The Luna menu bar is missing on the secondary Mac.

Note: This issue mostly affects Macs running macOS Ventura 13 or later (including future betas).

Steps to fix a black screen on the secondary Mac:

  1. Quit the Luna Secondary app.
  2. Open Terminal (Finder > Applications > Utilities > Terminal).
  3. Copy and paste this command into Terminal and press Return:

    defaults write com.astro-hq.LunaSecondaryMac LNExclusiveFullscreen -bool NO

  4. Reopen the Luna Secondary app. You should now see the Luna logo and have access to the menu bar.

If you still see a black screen after these steps, please contact our Support Team for help.

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