So, my sound stopped working, seemingly overnight. I'm guessing it's PulseAudio. I have my xbox piped in through the line in and enabled via alsamixer and I can always hear that (as I expect), but my other applications: Nada. I heard the KDE login sound (ugh) and then nothing. No VLC, nothing from Chrome, Clementine doesn't play, and in fact doesn't even progress through the song (the same behavior it exhibited when I had PulseAudio directed to a bad output device).
So, is there anything I can check on?