Help....I have a Sharp Aquos LCD-TV (32-D7DU)and am a Comcast customer. I just had the cable card installed. I am connected via the Digital Cable in. I get all the channels above 119, including HD programming. I can NOT get any of the lower channels? To complicate matters, this Model has TV Guide function and I can not seem to get it to access any information. The Sharp manual is very poor. Help!