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If you are using the firmware I uploaded you may need to disable the discount smart controller (which I used on my build) and enable the full graphics controller in configuration.h


and enable:


you will also need to install U8glib to your ARDUINO library folder: http://code.google.com/p/u8glib/wiki/u8glib

As for the Rumba board I have no experience with it, although it looks like a great board and will probably be ok (it seems to have sockets for the stepper drivers which makes modification much easier)