I bought an Apex AD-1200 this summer and it's worked great...that is, until now. I was moving the DVD Player around while installing a 5.1 surround sound system, and now, it won't work right. Any DVD I put into it plays no sound at all, although the video comes up clearly. Also, SVCDs will play for the first second or two and then the DVD player will revert back to the main screen (the one that's displayed when you first turn on the DVD Player). The only type of media that works fine is VCD. What has happened to the DVD player, and how can I make it work again?!