So, a few years back I bought my first HDTV, and noticed faint diagonal lines in the picture when running my Xbox at 720p. The lines were moving back and forth, which was kind of distracting. There were a lot of potential causes at the time. It was a cheap off-brand HDTV, I was using a cheap Chinese component cable, and there was probably a lot of signal noise because in my small apartment I had to plug pretty much everything into two daisy-chained outlets. There were so many potential causes, I decided to just ignore the lines--they were pretty faint.
Fast forward to now. I've just bought a gorgeous new Samsung LCD, and moved into a new bigger place where I don't need to bunch up all the plugs and wires in one place. I have my PS2 and Xbox hooked up with one of those combo component cables, and the lines are still there. If anything, they look worse than ever--maybe it's because I can see them more clearly now with a nicer TV. Now, despite being connected to the same cable, there's no noise or lines when using the PS2. Only the Xbox. The problem clearly wasn't the TV, (it's new), or the wire setup, (I've moved), and I even have two different sets of those combo component cables to test with (both have the noise problem). The only constant factor in all this is the Xbox itself...is it possible that my box is somehow outputting this noise? Is this a known issue, and is there any way to fix it?
Both of my component cables are third-party ones from Hong Kong, so I was considering the Monster Cables. But I don't even know if the cable is the issue, and I've heard they fit so tight that they damage your TV if you try to remove them.
Sorry for the long, long post by the way.