I dumbly connected a 9v battery to the ground and 5v pins instead of ground and Vin, while my computer's USB was also plugged in. This turned off my Macbook Air. Now, the port to the Arduino UNO is not showing up in the Arduino app in OS X. However, the last program I loaded on the Arduino Uno still…

Did I fry my Arduino Uno's USB connection?

EmmanuelHernandez May 2, 2014, 3:20pm 3

and also doble check the main voltage conections.

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