I currently have a 7-year-old Sony Trinitron TV, a Comcast (Motorola) digital cable box with DVR, & a Symphony brand dvd/vcr combo. I am trying to hook them up so that they will all work in conjunction with each other. I have all the coaxial set up correctly, but I can't get the RCA cables running so that I can use the DVD/VCR. Any suggestions would be GREATLY appreciated. MY 3-year-old son would very much like to watch his Blue's Clues tapes.