For some time now, I have double vertical lines, about ½” apart, on my screen. They simply come and go and I can’t get rid of it. I was thinking it was my screen and since I was thinking about upgrading it, I bought a new screen. NO GOOD. It was all good at first but as the time went on the lines returned. Sometimes shutting the computer off and turning it back on takes care of the problem for a while but not always.