I have a new arduino UNO R2 board.
When plugged on mac os x, the green led lit and the orange one blinks (first I think to show the bootloader work and then regular pace like the blink sketch).
But it does not appear in serial port menu from arduino 1.0.1. It does not create a tty.* device in /dev/, it does not show in hardware -> USB list from System Information.app.
I then tried to flash the dfu as explained in this post :http://arduino.cc/forum/index.php/topic,52447.msg374201.html#msg374201
Then I saw that the second wire is not necessary since in the R2 there is already a resistor.
I tried the dfu programmer but no device is found.
I tried to go through a hub (from my dell lcd) as explained here :http://arduino.cc/forum/index.php/topic,88195.0.html
Then I tried to plug the board on windows XP on a thinkpad.
Nothing, no com port in System conf.
So it seems I have a new board with the mega8u2 not functioning.
What can I do ?
Is there a way to program the board through the ICSP ? How ?
Thanks for your help.