Dont think it has a setting in the bios as to on or off. you didnt say what os you have on the machine. asuming it is xp navigate to control panel,sounds and audio you will find advanced button look and see if it's muted if so uncheck muted. next show volume icon on toolbar checked apply this. under the audio tab you can adjust the volume here also. next ime you can go to the same propertys page by clicking the spkr horn on the right side of the taskbar.