Steps to fix Windows 8 audio
1. Click on the Desktop tile from the Home (Start) screen.
2. First of all on your task bar at the bottom right hand corner you will see a speaker icon. Make sure it is not covered by red circle. If it is then the speaker is muted. To unmute, click on the unmute icon.
3. Next, If your problem is still not fixed, then make sure your speaker is not disabled. If it is then enable it. To do that, first rightclick on the speaker icon on the task bar and select Playback devices.
4. Next, right-click on the Speakers and select Enable. Then click on the Apply button and then OK. By now your issue must be fixed. If not then your audio driver is not correct or is corrupt. Re-install the audio driver. That are the complete steps to fix Windows 8 audio.
Make sure your speaker is not muted or is not disabled before re-installing the audio driver.