dummy output ? -no sound

[noobusinglinux]

hi guys
i am currently using fedora 13 on my acer laptop
and im experienceing this little anoying little glitch where my audio cuts out and loads some kinda dummy output device it hapens when im in the middle of watching a movie or surfin the web often when this happens the compiz fusion desktop disapears as whell and when i try to enable it i get that error about acelerated 3d not being suported witch is imposible because my computer uses the standard intel graphics card
what i tmporarily do is i simply logout and log back in again the compiz fusion loads right away and the sound comes back after i login and out several times
is there a way i can just get rid of the null/dummy output device?

[weitjong]

Kill the pulseaudio daemon and it will spawn back to life automatically with proper output device.

$ pulseaudio -k

[noobusinglinux]

that sorta worked better i rian that then logged out/in again the sound started working

[Aravindv]

I am suffering with the same problem "Dummy output",
for this:->]# pulseaudio -k
i got an error message as: E: main.c: Failed to kill daemon: No such process

please help me....