Hi, Good morning 96RAF, you and Chris have been brilliant and the reset has worked. Thank you both. I have to say sorry that I 've taken some time to get back to you. You see, I've suffered a stroke and my mobility is pretty awful. Anyway, it's done now but another problem has arrived and that's the sound function. To start the sound I press Function0. I try to press both buttons at the same time. Usually the screen either shows "On" or "Off" but now it doesn't. So I cannot fire up the sound. Any ideas?