Hi,
Go to Start Menu > Settings > System > Troubleshoot > Other troubleshooters > Sound > Run.
Check if that fixes the problem. If not, go to Start Menu > Settings > System > Sound, scroll down to "More sound settings," and on the Playback tab, right-click in the blank area and select "Show disconnected devices" and "Show disabled devices."
Check if there are any disabled devices and enable them.
If there aren't any, go to Device Manager, navigate to the "Sound, video and game controllers" section, take a screenshot, and post it here.
Thanks.