If Logic Pro opens, you might need to update or service your external audio interface. Open Logic Pro and immediately press and hold the Control key before a project opens.Open Logic Pro without audio input and output
If you aren’t using an external audio interface, try bypassing third-party Audio Units plug-ins. If the project opens and plays back properly, you might need to update or service your audio interface. If you’re using an external audio interface, try using the built-in audio on your Mac instead of the interface. If an update is available, follow the manufacturer’s instructions to update the device or software. 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. If a Logic Pro update is available, click the Update button to download and install it.
Choose Apple menu > App Store, then click Updates in the toolbar.
