I have had my I3 prusa for 5 month now, and suddenly the Melzi board stopped working. I noticed my LCD screen was blank and when I tried to connect, neither Repertier or pronterface would connect. It shows up when I check if the correct FTDI drivers are installed, and it is the correct one's. When I press reset on the board, the LED flashes once, when in USB mode, though otherwise it wont rby DTU_ALEX - Reprappers