Toshiba 32HF73 32" TV "lost sound direct box" Questions

...lost the sound. I have checked my connections, the mute button, the internal speakers, but no luck. I thought the problem might be in the cable box; but, when I hooked up the new dvd player directly ...

...lost but it worked fine with the universal one. One day I accidentally brought up the menu and when I hit "exit" the data cleared, but the big black box remained on the screen. The sound is fine and ...