Please try the below mentioned steps and check if this fixes the problem:
1. Run the Windows Audio Playback Diagnose and Repair from the below MS FIX-IT:
https://support.microsoft.com/en-us/help/2970908/how-to-use-microsoft-easy-fix-solutions 2. Check for Hardware or Software Configuration Changes in Audio Settings (you can go to Audio Settings by right clicking the volume icon at the bottom right side of screen and selecting "Open volume mixer" and then click the speaker icon.
3. Download and Install the Latest Audio Drivers and BIOS.
Note: Plug your computer to a good, working UPS before you update the BIOS. If you experience a loss of AC power or a significant voltage sag/spike during the BIOS flash, you will either have to buy a new BIOS chip or buy a new motherboard.