If you've had a lot of Arduino DUEs go through your hands (or if you are just unlucky), chances are you've come across at least one that does not start-up properly.The symptom is simple: you power up the Arduino but it doesn't appear to"boot". Your code simply doesn't start running.You might have noticed that resetting the board (by pressing the reset button) causes the board to start-up normally.The fix is simple,you just solder a 0805 10K resistor across the top of this mosfet: