Hi Barbara, My name isXXXXX am sorry to hear that happened. I will assist you with your Panasonic Quintrix sound issue. Please allow me to ask you a few questions as we get started diagnosing this problem... Did you make sure the Sound is not muted on the Sky box remote? The mute button is just above the volume button.
Which Sky box do you have?
Try connecting another device to the TV, (dvd player, etc...) Does the sound work?Have you tried a different cable from the Sky box and the TV?
Is the cable HDMI?