Light up the printer scress by  button ALT + UP  /Down  No matter you buy a new original Markem Imaje  printer LCD screen or the second hand,original . At the time you install on the Markem Imaje printer .You may find it is color blank/grey.Don't worry.It's no broken. What you need to do now is pressure two buttons  one button is ALT ,the other is UP or DOWN  as below picture . At this time the Markem Imaje printer LCD screen is light up again .