I recently got my first Arduino board (Uno), so it's possible I am just doing this wrong, but my board when hooked up with the USB cord that came with the Arduino is not showing up. I tried seeing if the USB was even showing up on my computer by going to System Report (under about this mac) and seeing what was connected through the USBs, but the Arduino would only show up for a second after I unplugged it and then replugged it into my computer. The number of ports never changes in tools when I unplug and replug the board. I have tried using a different plug and the same thing happens. The correct port occasionally shows up on my screen, so I have been able to upload my sketch onto my board twice, but the port always disappears after a few seconds. Am I doing something wrong, or is my board defective?
update: I tried pushing the cord in hard on both the board and the computer and now the port will appear and connect, until I try and upload the sketch. The second I push the upload button, it disappears. Anyone know how to fix this?