no sound after installing Snow Leopard ?

[geordiejohn]

hello i have got an Apple minimac 80gb and since i installed Snow Leopard i have got no sound from my monitor speakers,when i look at system pref. the sound is set to headphones but i do not know how to change to speakers,any ideas please?
thank you.

 

[Hellhammer]

System Preferences -> Sounds -> Sound out. What options you have there? Internal speakers and?

 

[geordiejohn]

headphones-built-in output

 

[geordiejohn]

all ok now,wifes fault she had gone to the menu on the monitor and muted the sound.
sorry and thank you for all help given.