Possible loose screen connector due to movement of the hinges. You would have to open it to insert it back properly.
Did you clean it or apply little tonguing process before inserting it back? It could be the screen connector cable is broken. However, it could be the screen is faulty altogether. You are welcome, sir.
Had a similar prob with a Dell XFR turned out that the flex cable had broken conductors where the cable came through the hinge between the screen and the base replaced the whole top of the laptop and later discovered I could make the screen work by using an ordinary cable touchscreen obviously would not work the screen is now on an ordinary (non rugged) laptop ...T