Hi, I'm having some problems trying to run my RUMBA + FGS-LCD-C with my in progress build new printer (TAZ). I wanted to check my first wirings (X motor, X endstop and FGS-LCD-C). A picture : The first problem I have is that the USB connection doesn't work. A detail in case it can be usefull, the TR/RX lights were off all the time. I followed the instructions reported on the RepRap wiki (DFU mode...), without any success. So I flashed the 16u2 chip with my USBtinyISP and the firmware given on RepRap wiki. Since then I have the TX/RX orange lights on all the time, no blink, like on the picture. No USB connection under Windows XP. I have something using Ubuntu. So using Arduino IDE under Ubuntu, I tried to upload Marlin firmware. It doesn't work reporting timeout issues. I connected my USBtinyISP on ATMega2560. By this way it seems the firmware upload is working (I'm not an expert, I don't really know if it is effectively the case). But, if now I have light in the LCD, nothing displayed, it doesn't work. And no connection with host. So I tried to flash the ATMega2560 with my USBtinyISP. I got a verification at the end : I searched the net and it is unclear if it is a real problem or not. Some are reporting their boards working after such flash with this message. What I can report in my case is that it didn't change anything. I still can't upload firmware directly via USB, and what I think I've uploaded via USBtinyISP, behaves the same way (light in LCD but it deosn't work). Any help, check, idea or orientations are welcome. Regards PS : I reported a ticket with my order reference.