I went into Youtube and clicked on the first video I saw to test out the sound after a driver update, and this is what popped up:
It took me about ten seconds to realize that this was gameplay of some sort. …Of a very obsessive and unusual kind. I suspect that I would not personally enjoy playing this game.
A rhythm game called Osu!
But the important question was unanswered: How was the sound test?
It worked fine. I have no idea why the icon was saying that the volume was disabled, and it fixed itself as I was listening to the music. I dunno; I just hit the clattering flat thing and words come out.
Most likely an Osu! level. Osu! is a fan made rhythm game engine for making games very similar to Nintendo’s Elite Beat Agents/Oudendan! games. As fan made levels tend to be, this one is particularly hard, but more reasonably scripted levels are quite fun to play.