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The LCD I was using talks over i2c so requires you to use the SDA/SCL pins. On the pro mini it looks like those are the a4 and a5 pins that are slightly inside the board and not on the edge

http://img05.deviantart.net/8f5c/i/2015/233/1/a/_arduino_r___like_pro_mini_pinout_diagram_by_adlerweb-d96h91k.png