Could be digital artifacts.
First, what are you using as a source, and what connections?
Second, do you have the sharpness turned way up?
Some cables can also cause "ringing" in which case you could get some vertical lines.
I had a nice red vertical line to the left of my image that I identified as ringing. Panic set in at first, but then
I changed cables and it was gone.
Note, if you get NO artifacts in the built in test pattern, it is most LIKELY in your source, processing, or cable.
Welcome to the darkside.....