Hello! yesterday I changed to an ssd disk on my Imac 27" A1419 late 2012. I was extremely careful through the whole process. Anyhow after putting everything together i now have a 2inch wide black vertical line on the Lcd. Initially the dead bar was gray an after a while it became black an has been so ever since. The black bar come up immediately when booting. Anyhow the picture is good when connecting to an external monitor. I guess that excludes a GPU problem. Judging from the attached picture what do you think? is it the LCD or the LVDS Cable?