Lcd displaying squares

Hello everyone I'm very new to all this about my first week with it i know little to nothing..

My displaying is showing white squares bottom row nd top row..

My setup is a Rostock Max V2 3-D printer to a Rambo board to LCD display

Again I'm new so if you guys can help it would be much appreciated

What firmware are you using for printer control (Marlin for instance)? There may be configuration that needs setting in the firmware.

Hello, i believe im using repetier host?