same issue here

for me it was a conflict with asterisk (which is started early as system
service); it blocks the sound card so pulseaudio cannot grab the card

I found out what was going on by
pulseaudio -k
pulseaudio -vvvvvvv
which indicated that the sound card couldn't be opened

and then I figured out with
sudo lsof | grep pcm
who has opened pcm devices

after preventing asterisk from starting, pulseaudio works again

I guess there might be more programs which conflict with pulseaudio...

-- 
pulse audio null output
https://bugs.launchpad.net/bugs/373864
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