HT204308: Find the serial number of your Apple product
Learn about Find the serial number of your Apple product
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Helpful answers
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May 20, 2016 7:42 PM in response to violet826by Allan Eckert,Writing an effective Apple Support Communities question - https://discussions.apple.com/docs/DOC-5931
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May 20, 2016 11:42 PM in response to violet826by Kenichi Watanabe,If possible, try a different USB docking cable to rule out faulty cable as the cause. Or use the current cable with another device to confirm it works properly.
It would also help to know if you use a Mac or Windows PC. If Windows, what version?