I went through the steps suggested by James and here is what I got: Thanks for the replies! Much appreciated!įirstly, I had selected the correct board and serial port. I've found a few posts describing similar problems but most of them are quite old and none of the info there has been helpful in my case. In 'Networks' a new network was made but is constantly 'disconnected' (and can't be connected). I did NOT get a pop up regarding a new modem when I plugged it into the computer. I followed the the installation instructions to the letter (tried 3 times already). When I plug it into the computer the green 'on' light comes on and the L led blinks orange. I have no other programs running, nothing plugged to the board and nothing plugged to other usb ports of the computer. Here is some additional info that may or may not be relevant:

In short, I get this message when I try to upload to the UNO: Serial port '/dev/tty.usbmodem411' already in use I just received my Arduino UNO board in the mail (my first ever, so I'm a complete virgin) and have spent the whole day trying to get it working but with no luck.

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