I have a RGB LCD (16x2) hooked up to an Arduino Atmega 1280. I can't get the LCD to display anything but solid blocks all the way. The LCD is wired exactly like this (http://arduino.cc/en/Tutorial/LiquidCrystal
). The code I am running is the "Hello World" example, unaltered. I have the arduino IDE (Version 1.0.3). A 10k potentiometer is hooked up so the middle wire is running to the third pin on the LCD. I am not sure on how to activate the backlight in multiple colors (the 15th pin is on +5V and the last three go to GND). Much more importantly, the LCD isn't displaying data. I thought the LCD was bad at first and got a different one. But the same issue is occurring. I've scanned many posts dealing with LCDs and none have solved the issue.