If your audio is not working and you got this in your syslog:
pulseaudio: [pulseaudio] sink-input.c: Failed to create sink input: too many inputs per sink.
The issue is generally caused by too many audio inputs, or in other words you have too many applications that are hooked into pulseaudio.
An easy and notorious offender is by having dozens of Firefox browser tabs open.
Close all of your Firefox and the problem will........