I have 2 Arduino boards. One is working fine but the other has a flashing light next to 'L' and I can't select the correct serial port (/dev/tty.usbmodemfd131) because it doesn't show up in the list and therefore can't upload any sketches. Can anyone help?

/dev/tty.usbmodemfd131

system October 12, 2012, 8:47pm 3

Many thanks, I'll give it a go.

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