Help with LCD 2004A-V20, please

Everything is now built and looking pretty good. Bought what I think might be a Mini Rambo clone with a 2004A-v20 lcd panel.
Got it setup for testing and managed to control things through Repetier Host just fine but I cannot control anything from the LCD panel. I get the series of white blocks that i know others have seen and have tried editing the configuration.h file as suggested by Ryan and others but no luck. I tried flashing the latest Marlin firmware and now I get a red led lighting up on the Mini Rambo which goes off temporarily when I press the reset button on the LCD panel. I can’t find what the red led signifies.
Any thoughts anyone on what I should try next?

You have to remove the custom boot screen file, comment out the custom boot screen, comment out the current LCD, and uncomment the other reprap discount lcd

Thanks, Ryan. You’re a star my friend! It’s now working perfectly. Many, many thanks.

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