Hi, I've got a little problem, when I connect my UNO to PC, the "L" LED doesn't turn ON, it is OFF. When I disconnect GND wire it turns ON, it never did before. Can someone explain me that ?

"L" LED on Arduino UNO

weedpharma January 2, 2016, 12:52am 2

Give a picture showing clearly what is connected and which wire you are removing.

Weedpharma

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