系统声音问题，请求解决？

whatday

我用的audacious每次打开就出现：
Couldn't open audio.

Please check that:
1. You have the correct output plugin selected.
2. No other programs is blocking the soundcard.
3. Your soundcard is configured properly.
错误，mplayer打开也没有声音，只有reboot一次才正常，我估计是系统哪里出了问题，这个怎么解决啊？

whatday

高手些帮帮忙撒！