Thanks for your help. I called my cable company, Comcast. They want $5.99 / Mo for an extra regular cable box & $12.99 Mo for an extra HD Cable box. The rep said the HD Cable box will have the component RCA Red, Blue & Green as inputs on the back. This price seems high, maybe I don't know the market price. Before I bought I had some thoughts. Does a "Cable Box" absolutely have to be rented, or purchased from the cable company (In this case Comcast), or can I buy one somewhere, Store, internet, etc. that will work the same way? 1) The rep said I have to buy it from them. I don't know if this is True or he was reading off a memorized revenue generating script. Help?....... 2) I noticed my proj has DVI input. Would it be better to get a cable that is Red/Green/Blue from the cable box to VGA, or Reg/Green/Blue from the cable box to DVI (Which I notices is available on the site you recommended (Monoprice) The prices of either were very reasonable 3) Will 50 Ft be a weaker signal than 25 Ft? 4) I plugged just the Yellow RCA video input from the back of my main existing current cable box to the back of my projectors Yellow RCA video input & the image wasn't stable. There is a periodic vertical bar from top to bottom part of the time & the picture image goes up &its like looking at the same image on an old camera film, like on ancient black & white TV's that had to be adjusted. 5) Is DVI the best over VGA & S - Video? I need to learn a lot. Any help would be appreciated Thanks, Will