I bought an Arduino UNO Rev3 a couple of days ago. I started coding some sketches and tried to upload them. I needed three attempts to get the mac (Yosemite) auto adding a modem device and get the IDE software uploading the sketches.
Everithing worked fine until yesterday. Uploading a sketch I got this error:
avrdude: ser_open(): can't open device "/dev/cu.usbmodem1411": No such file or directory
I've tried to connect to it from an old macbook with no success.
Also tried to reflash the firmware to the ATMEGA16u2 but I can't connect to it. I can't see the Arduino at the system report USB.
The green ON LED is lighting. The 'L' LED blinks once when I plug the board to the mac.
I've tried to wire again the las project I was working on and IT WORKS!
What can I do? Thank you in advance.