Today I have encountered this problem. When i have turned on my computer everything was completely normal like every time. When i was about to listen to some music I noticed that theres no sound, I increase the volume, still nothing, check if it's muted. no it's not,it's at full volume but nothing is playing. Weirdest thing i have noticed is that it actually shows that nothing is wrong with sound, that it's working and is on full volume. What could this be, I have never encountered this before.