|If you made a change to your computer system, your best bet would be to perform system restore to the point where your audio was functioning normally. If this is caused by a software issue, system restore is almost certain to get your audio working again.|
If the above solution is not work, your issue is probably hardware related. The best way to confirm this would be to remove the sound card and try it on a friend’s computer, if it doesn’t work you have your answer.
If it works on your friend’s computer, it could be due to incompatible hardware or software (doesn’t apply if your sound stopped working abruptly) or stubborn malware continually hijacking your audio drivers, which could be fixed by running a virus scan using a reputed antivirus like Kaspersky.