If Logic Pro isn't working

Before proceeding, make sure to back up the Logic Pro app.

After trying each step in this list, test Logic Pro again to see if you've fixed your issue. 

1. Restart your mac
2. Update Logic Pro
3. Check device and software compatibility
4. Use built-in audio with Logic Pro
5. Open Logic Pro without audio input and output
6. Bypass or remove third-party Audio Units plug-ins
7. Test with a new project
8. Test with a new user account
9. Delete the control surfaces PLIST file
10. Reset Logic Pro settings
11. Delete the Logic Pro PLIST file

Choose Restart from the Apple menu .

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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.

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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.

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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 > Settings (or 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.

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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.

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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, then press Shift-Command-N to 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.

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Create another standard or administrator user account on your Mac, then try to recreate the issue in the new user account. If the issue doesn't occur in the new user account, settings or files in the original account might be causing the issue.

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If you use a control surface with Logic Pro, try deleting the PLIST file for control surfaces.

1. Quit Logic Pro.
2. In the Finder, choose Go > Go to Folder.
3. Enter ~/Library/Preferences, then click Go.
4. Delete the “com.apple.logic.pro.cs” file from the Preferences folder. 
5. Restart your Mac.
6. Open Logic Pro.
7. Depending on your control surface, you might need to add the control surface again to use it with Logic Pro. 
   • If you're using Logic Remote, you're prompted to reconnect Logic Remote when you open the Logic Remote app for the first time after deleting the PLIST file.
   • If you're using a device that supports the EuCon protocol, you don't have to add it within Logic Pro. 

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Resetting Logic Pro settings 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 > Settings (or Preferences), and note any specific Logic Pro settings that you’ve made.
2. Choose Logic Pro > Settings (or Preferences) > Reset All Settings (or Preferences) Except Key Commands. 

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

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1. In Logic Pro, note any custom preference settings that you’ve made, and save any custom key commands that 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, also remove the "com.apple.logic.pro" file. 
7. Restart your Mac.

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

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Contact Apple Support

• Avoid system overloads while recording or playing back.
• Minimize the amount of latency (delay) you experience while recording audio or playing software instruments.