We had a Sony Vega (?) once and it only lasted a few years.
We just bought a Vizio and it's got a green line running down the right side on some channels. I'm going to take it back (probably replace it w/another Vizio). Never had a Vizio before but the picture is fantastic in HD.
Had the same type of thing happen w/a Samsung...had to take it back and get another one..no probs w/the second one.
EDIT: Took it back got another one...same green line. I fixed it w/the H/V Positioning function