Since you are not sure what caused this problem, I advise you follow steps on the following website:
https://support.microsoft.com/en-us/windows/fix-sound-problems-in-windows-10-73025246-b61c-40fb-671a-2535c7cd56c8
The troubleshooter might be able to detect and fix some of issues.
Sound only coming out of discord and system sounds
So basically, I let my little brother use the computer and now YouTube and all of my games sound doesn't work at all. I tried rebooting, checked the output sound, and checked to make sure nothing was muted and it was all working. The sound worked fine just yesterday.
2 answers
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Reza-Ameri 16,866 Reputation points
2022-03-26T14:21:05.337+00:00 -
Wiktor Pers 1 Reputation point
2022-03-26T15:40:36.957+00:00 Check the Windows volume mixer. You can find it under the speaker icon on the taskbar. In the same place, you can find "Troubleshoot audio problems". Also read the article already linked by @Reza-Ameri (https://support.microsoft.com/en-us/windows/fix-sound-problems-in-windows-10-73025246-b61c-40fb-671a-2535c7cd56c8). I hope your problem will be solved. Regards, Wiktorpers.