I don’t know about anyone else, but I have noticed that since I ran updates into my Windows 8.1 laptop the other week, my audio on my laptop has failed completely at least twice. Today it quit very annoyingly right before I tried to make a Skype call. Right off, I thought I had a device (headset) failure, or a mute button pushed, or something like that. But no.
When this happens, ALL audio is gone. Not just SfB/Lync. System sounds, dings, dongs, and other helpful bleeps are simply not happening. This is a Windows 8.1 operating system thing.
I have a Lenovo T530. But, some google-fu and some University of Bing show that this is not just my Lenovo.
How to fix this?
Well, rebooting did not seem to work. But this did:
Start services.msc, go to Windows Audio Endpoint Builder, and restart it. This will prompt you to accept a restart of the Windows Audio also. Do that. On restart, your audio will be back.
And you should be good.
Keep in mind that I have now had to do this several times (or at least twice) and while this fixes the issue, the restart does not seem to completely fix the issue, as it has come back at me.