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The shielding of a USB housing is connected to the PC which is also connected to earth ground. Ground on an arduino, when connected to USB will also be earth ground. If it's critical you can purchase a USB ground isolater. Dave at EEVblog has a few videos to take note of, particularly the how not to blow up your oscilloscope by avoiding ground loops, one in which he directly shorts a power rail with his scope ground lead. Don't connect more than 12v to an arduino Vin. 5v is a pin that provides a regulated voltage to a project. Perhaps if you use another voltage regulator to obtain 7v or supply 7v, you can use that. I've personally used 12v to Vin while the PC is plugged in though, no wuckers as Dave would say. I should note here that my Korad KA3005P DOES NOT have a jumper from earth ground (green terminal) to power ground (black terminal). Try to isolate your power supply from earth ground and you shouldn't have a problem.