First use of Arduino Uno : avrdude error on Blink uploading

Hi all,

I just bought an Arduino (or should I say Genuino) starter kit. This is my first test and it is failing.
I have follow religiously the first pages and when I am trying to upload the blink sketch, uploading fails with an avrdude error : avrdude: stk500_recv(): programmer is not responding.

As suggested in other posts, I have tried

  1. to switch to the latest Hourly build of Arduino IDE
  2. to switch to a previous stable version of the Arduino IDE (1.6.09)
  3. to change the USB cable to one that I know is working fine
  4. to make the same steps on another computer (unfortunatelly, all of them are macOS running on macOS 10.11.6, so not really an interesting test)
  5. to press reset before the upload, interesting thing : the TX led never flashes

The full log is attached. Any idea of why this is happening ?

log.txt (32 KB)

To save people having to download the log, it's a sync error, resp=0x00 every time:

avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding

and he's running a 1.6.11 hourly with AVRdude 6.0.1.