The Leonardo requires that DTREnable be set to true. Are you setting that when opening the serial port? The default is to set DTREnable to false, for most software that deals with serial ports.
Also, what software is installed on the Arduino?
The Leonardo requires that DTREnable be set to true. Are you setting that when opening the serial port? The default is to set DTREnable to false, for most software that deals with serial ports.
Also, what software is installed on the Arduino?