I have a strange issue with an old Lenovo desktop PC after I installed Windows 10 on the weekend: In the notification area, the audio / speaker symbol has a red cross / sign indicating an issue.

Are Sound, video and game controllers devices missing from your Device Manager? If yes, this post will help you resolve the issue. Many users have reported that they can’t find a Sound, video and game ...

This seems like a really obvious thing I am somehow missing... but how do you set a default audio device for output? I have like a million, because I have 3 monitors that all support audio passthrough ...

Struggling with Windows 11 "System Sounds" missing? Discover proven fixes to restore your notification chimes and error beeps ...