If Logic Pro X isn't working

Choose Apple menu  > App Store, then click Updates in the toolbar. If a Logic Pro update is available, click the Update button to download and install it.

If you're using an external audio interface, MIDI interface, storage system, control surface, or plug-in not made by Apple, make sure that it’s compatible with the latest version of Logic Pro. Contact the manufacturer for support. If an update is available, follow the manufacturer’s instructions to update the device or software.

If you’re using an external audio interface, try using the built-in audio on your Mac instead of the interface.

1. Unplug your external audio interface from your Mac.
2. Open Logic Pro, then choose Logic Pro X > Preferences > Audio/MIDI > Devices.
3. Choose Built-In Output from the Output Device pop-up menu.
4. Choose Built-in Microphone (or Built-in Input, depending on your computer) from the Input Device pop-up menu.
5. Open and play back a project that's been experiencing issues.

If the project opens and plays back properly, you might need to update or service your audio interface. Contact the manufacturer for support.

If you aren’t using an external audio interface, try bypassing third-party Audio Units plug-ins.

1. Open Logic Pro and immediately press and hold the Control key before a project opens.
2. In the alert, click Don’t Launch.

If Logic Pro opens, you might need to update or service your external audio interface. Contact the manufacturer for support. It can also mean a third-party Audio Units plug-in might be damaged, or it might not be compatible with your version of Logic Pro. You can try bypassing plug-ins to troubleshoot your issue.

If you’re using Audio Units plug-ins, try bypassing or removing them.

You can create a new project and test to check if the issue is with your project or Logic Pro app.

1. If Logic Pro is open, quit the app.
2. Open Logic Pro and create a new empty project.
3. Add Apple Loops to the new project.
4. Try to recreate the issue you were having. For example, if the project you're having an issue with uses a particular third-party plug-in, add it to the test project. If the problem reappears, the plug-in might be damaged or might need to be updated.

Create another user account on your Mac, then test Logic Pro with the new user account.

Resetting preferences doesn’t affect your project files, presets, or patches. However, you do lose any custom preference settings that you might have made.

1. Choose Logic Pro X > Preferences, and note any specific Logic Pro preference settings that you’ve made.
2. Choose Logic Pro X> Preferences > Reset All Preferences Except Key Commands. 

After resetting preferences, open your project and try to reproduce the issue that you were experiencing. If the issue no longer occurs, open Logic Pro preferences and reapply your custom preference settings.

1. In Logic Pro, note any custom preference settings that you’ve made, and save any custom key commands you've created. 
2. Quit Logic Pro.
3. In the Finder, choose Go > Go to Folder.
4. Enter ~/Library/Preferences, then click Go.
5. Remove the "com.apple.logic10.plist" file from the Preferences folder. 
6. If you upgraded from Logic 9 or earlier to Logic Pro X, also remove the "com.apple.logic.pro" file. 
7. Restart your Mac.

After deleting preferences, open your project and try to reproduce the issue that you were experiencing. If the issue no longer occurs, choose Logic Pro X > Preferences, reapply your custom settings, and import your custom key commands.

Delete Logic Pro, then redownload and reinstall it. Libraries won't be affected

If you're restoring Logic Pro from a backup, you can either drag it from its storage location to your Applications folder, or you can restore it from a Time Machine backup.

Contact Apple Support.