I've got a Sony 5.1 surround sound system with built in DVD player and AMP. The problem it has just turned its self on to heaphone settings and won't change onto any of the surround sound settings. I have no idea what to do I've unpluged and left it for a while to see if it would reset its self but I've had no luck. Any suggestions or ideas would be great as its just run out of its Guarantee. Thanks for your help