LCD driver board will show the line as in the picture when failed. Thats why I asked if you get any text on the screen, or OK screen. If you get text during boot up (Tiny OS2) then the screen scrambles after boot, that indicates the LCD driver board or a bad driver software in the OS2. If the screen doesn;t scramble and just sits and waits, its something on the Mits side most likely. I would suggest re seating the connectors on the main board first. You MAY ​loose zero return by doing this, but its not hard to get the zero back once the machine boots. You can also try to re-seat the fiber optic board on the mapps panel.