Hi ! I own a Mendel90 from Nophead may 2014. The USB connector has been crashed and the repair was unsuccesfull. I ordered a card "Melzi 1284p 3D Printer PCB - ATMEGA1284P with Heatsinks - RepRap, Mendel, Prusa" from wedo3dprinting. Flashed with firmware from Nopheads github. Success Open pronterface, Endstops OK. (M119) X motor - Debug communication OK, motor not moving Y motor - Debug cby hest - Mendel90