I have a brand new arduino(original), and it is not showing up in Device manager or anywhere else. Even the computer doesn't Prompt anything. I am using Windows 7 32 bit.

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    Have you tried a different cable? Different computer? – Ignacio Vazquez-Abrams Jun 2 '15 at 5:48
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    Is there anything connected to it? (Like sensors and what not) that could be wired up wrong. Is the power light on? – Tom Carpenter Jun 2 '15 at 20:39
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    It worked with a different cable. – Clarskon Jun 6 '15 at 16:23

As the OP reported: It worked with a different cable.

I converted his comment to an answer so the system would regard this issue as solved. Please accept this answer.

Some cheap USB cables only carry power, and not data. I have such a cable that came with a USB desk light. To save money they only run two wires and not four, since the desk light is not a data device.

Be cautious about grabbing any old cable from your desk for testing. Make sure it is designed for data use. If in doubt, try a known good cable.

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