I have a WS-65908 TV. The TV works fine with a non-HD signal, but when it is connected to a HD (1080) cable box the picture in a picture comes on and won't go away. I spent 1 1/2 hours on the phone with Mitsubishi and talked to about 10 diff. people. I tried everything they could think of including resetting the whole system. Nothing worked.... The cable box is hooked to the tv via the DTV imputs with component cable... Nothing else is connected to the TV. Any ideas?