pulseaudio suddenly stopped working?

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http://unix.stackexchange.com – I am using arch linux and i was using pulseaudio suddenly today pulseaudio stopped working and no sound is coming in both my speaker and headphone. I can see pulseaudio is running properly and I am able to hear the beep sound from my computer but not any other sound??? any suggestions please I had already read the wiki page. I run pulseaudio as root and I had added my root in audio group (HowTos)