Complete n00b here. I'm pretty sure playing music is crashing it (crashing: no response from keyboard/mouse - must cut power to restart) because it does not do it when a music player isn't running. I thought it was a banshee specif issue but Clementine does the same. I've been reading about "disabling pulseaudio" but I'm hesitant because no one has spelled it out as being the issue.
closed as too localized by Luis Alvarado♦ Mar 14 '13 at 16:55
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I would strongly advise against disabling pulseaudio.
I'm not sure what a solution for this could be without a little bit more to go on, but I myself tried a variety of "disable pulseaudio" fixes that caused me quite a few system issues. For me, the problem was fixed by tweaking my settings in "Sound" (accessible by typing in Sound via the Unity Launcher). Try going to the Hardware tab and testing your speakers, and selecting a different profile and/or tweaking settings before fooling around with pulseaudio in the terminal.