I recently upgraded to HDTV and called Comcast to install a HD-DVR, which turned out to be the Scientific Atlanta 8300HD. I had it for about a week and all was good, but then I started getting alternating green and purple color bars that scroll vertically. I know it's not the TV as DVD's are fine, but it's very annoying once I saw it on the cable connection, especially on B&W progamming. A service tech came and changed the component cables, and the problem seemed to go away. But after I put everything back in its place, they came back later. The guy had said these cables are very sensitive and should only be handled by the connectors, as handling the body causes the signals to mix. This sounded like complete BS to me, since we've been using RCA cables for decades now and I've never heard of such a thing. Still, the problem subsided for a little while, so I can't ignore the possibility. Are these just crappy cables, or is the box faulty? I've heard that this box has problems with the component outputs, could that be the problem? If anyone has had this problem and knows a solution, that would be great. If not, any ideas would be helpful; I don't know what to think here.