Many things can happen to cause various sound issues. Fortunately, there is a simple solution that works to fix almost all of them: Uninstall the sound driver.
To do that, first type “Device Manager” into the search box next to the Start button. This will bring up the option for the Device Manager application as shown.
Left-click the icon for the Device Manager, and this will open the Device Manager application window shown below.
Left-click the arrow next to “Sound, video and game controllers” and double-click the icon for your audio device.
This will open the Properties dialog for your device.
Then click the “Driver” tab, and you should see this:
Left-click “Uninstall Device” and you will see this dialog.
Left-click the box next to “Delete the driver software for this device,” and left-click the “Uninstall” button.
This will remove your drive. Restart your computer, and a new driver will be reinstalled automatically. This should fix your problem.