If playback is silent or not working, check the following:
Open Audio Settings (press the Y key) and verify the correct audio driver is selected.
Try switching from ASIO to WDM or vice versa to see if playback resumes
Ensure the Hybrid Audio Engine is activated in the audio settings.
Check that no other application is exclusively using the audio device.,
Verify that your tracks are routed to the stereo master and your master outputs to your desired audio device.