All of a sudden a green line appeared up the middle of my screen. The menu is fine, the home screens of Hulu/ hbo are fine, I start to play a show and a green line goes right up the middle and the right side of the line has blurred colors. The tv has been used very little since it was bought so what's up?
That sounds like a hardware problem with the TV. You should contact the manufacturer. Roku doesn't make the TVs; they just supply the software/OS.
Where can I get support for my Roku TV™? | Official Roku Support