5
1-you use the power buton to switch the computer on.
2-you use the volume control to turn rhe sound up or down.
3-I think there's a loose connection in the swicth. Sometimes it works and sometimes it doesn´t
4-Go to the control panel and click on the sound icon,then click on internal speaker
5-lf you select the mute box you won´t be able to hear anything
6-a no signal message means the computer is not conncected to the monitor
