How do I fix my audio device is not plugged in?

How can I fix problems with speakers and headphones?

1. Update the audio driver.
2. Re-enable your sound card.
3. Try your headphones/speaker on another computer.
4. Re-enable disconnected devices.
5. Disable the HDMI sound.
6. Disable Front Panel Jack detection.
7. Run Sound Troubleshooter.
8. Restart Windows Audio service.