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What happens if you don't have anything connected at the source end of the cable? Still hum?
And how about with nothing connected at the source end of the cable, but with pins 2 and 3 shorted together (or tip and ring, depending on the connector)?
Or with pins 1, 2, and 3 (or tip, ring, and sleeve) all shorted together?
(you can briefly connect these pins together with a piece of wire or aluminum foil)
Lastly, unplug the cable and use a multimeter to check continuity from one end of the cable to the other, and from one pin to another (make sure your shield is connected all the way through, make sure there's no internal shorts from one conductor to another).
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