Audio. I hear no sounds over my speakers. When I try to open the volume control, it tells me that

Question

I hear no sounds over my speakers. When I try to open the volume control, it tells me that there is no playback device. I know there is, because two weeks ago, there was no problem, now there is. I've tried updating drivers and rolling back drivers, I probably screwed it up worse, I don't know. Do you have any clue?