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No Sound in Fedora 17

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http://forums.fedoraforum.org – When I try to watch Youtube videos, most of the time the sound does not work. Sometimes it does, I'm not sure why. Also, VLC audio does not work. Can someone please help me figure out what's wrong? When I run "play /usr/share/sounds/alsa/Front_Center.wav" no sound plays and I get an error: Code: ALSA lib pcm_hw.c:1466:(_snd_pcm_hw_open) Unknown field slave play FAIL formats: can't open output file `default': snd_pcm_open error: Invalid argument When I run 'dmesg | egrep -i "(alsa|sound)"' I get: Code: [  18.668170] ALSA sound/pci/hda/patch_realtek.c:1273 (HowTos)