New Arduino Uno, Arduino 1.6.3, MBP running 10.10.5.
The Arduino IDE is running, I connect to the laptop via usb. The green LED is on the amber light is on but it's not blinking.
I attempted to upload the blink file from File>Example>Basic>Blink. It compiles without issue but won't upload. I get the can't open device "/dev/cu.usbmodem1421" : No such file or directory...
I have attempted using the reset button, changing ports, cycling the IDE and the computer. The killer is that I've had an Arduino on this laptop before.
Any suggests for getting the Arduino linked and operational.