computer not starting, volume mute light on(red light)

At times when I try to switch on my computer, the on/mute volume on the top of the keyboard will show up and will not go off. At that time the screen will not open unless I restart the computer for about four times Sometimes I have to put it off for some minutes before it can start. Even after starting the light once a while comes on and the volume becomes mute unless I slide the volume control to the maximum level. This makes me spend too much time on any small job I try to do. Kindly help me solve the problem