It may be possible that the volume has been muted in the settings, due to which you are unable to hear the sound. Problems in Settings: Often, at times, the settings of your computer can get changed accidentally.If there is a codec issue, the sound on your computer will not work. Missing Codecs: The player in which you are trying to run your audio or video file may not have the necessary codecs that are required by your PC to play that file.
