Okay so my dad just recently bought a 42" Samsung Smart HDTV, he threw the box away so i looked on the back on the tv it said AC110? I guess that's what it is? But: 1.)Samsung smart HDTV (ac110?) it has 120v, 60Hz, 99W if that helps figure out the model, typical power is 42W is what it sayson the back without giving the model number 2.) a sony BVD-E390 blu-ray / home theater system 3.) cox communications Scientific Atlanta digital cable box 4.) 1 optical audio cable, 1 HDMI cable, and 2 RCA cables (the red and white ones), and two coaxial cables with a splitter. 5.) optional for cookies Xbox 360 is possible SO! The home theater system works fine with DVD's and Blurays the connection to the digital cable box to the tv is good. Currently HDMI cable from the sony home theater system to the TV, Antenna in to the cable box, antenna out to the tv, and the optical audio cable from the digital cable box to the home theater system. Basically the problem is we want to watch digital cable with surround sound, but everything i have thought of has not worked so far. Any help would be incredibly appreciated. What else (if anything) is needed and what am i doing wrong and/or missing?