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When I connect the Arduino to my PC the Led "ON" lights for a second then turns OFF. I wonder if the Arduino has a fault?

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Most likely a short between VCC (5 volt) and GROUND. When there is a short the fuse will kick in after a second, and disable the whole board, including the ON-led.

When you disconnect the board, the fuse will reset.

So either the board is faulty of the connection you made to it are.

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  • thx for the explaination,and help. Commented Jun 5, 2015 at 20:48

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