I just bought a this Samsung 50" HL-S5087W DLP TV last Friday and picked it up and installed it yesterday. There are these heavily noticable pupleish (in some cases green) horizontal bars that scroll vertically on the screen. It isn't a random pattern, it has the same formation every time it scrolls. I think it might be interference, but it does it regardless of whether I am getting a signal from my Cable Box (1080i) or my Xbox 360 (720p). Here is how it is setup: