Hi Anyone else had this problem? I have a Toshiba 42PW23P along with a Sony all-in-one DVD and surround sound. Had a good 18 months of pleasure out of it but recently when watching DVDs there is a hum that changes in volume from bad to v annoying intermittently. When I turn the TV off (and leave the DVD running) it goes away. Does anyone have any idea what this could be? It's very frustrating! Any help very gratefully received!