1

My Display wont work it only lights up blue

2

Have you set it up properly in your firmware? I know in Marlin that you need to edit the configuration.h to include the libraries so that it will work and then flash the firmware to the arduino.

Also depends on the Printer you are using.

http://reprap.org/wiki/RepRapDiscount\_Full\_Graphic\_Smart\_Controller

3

Agree with @InsaneCheese, the blue lit screen is the default when the screen has power. Now you need to tell your Firmware that it should send text/menu/updates etc to the screen. You do this by editing Configuration.h and un-commenting the relevant section as outlined in the article linked in the previous post.

good luck! Also check thingiverse for cases for the smart lcd controller, theres

loads of brilliant cases!!