60 Hz hum, the bane of electronics... 90% of the time it is a poor ground return somewhere. Check the cable, the connector (do you have a good meter to check continuity and DC resistance?) If the blue wire is ground it may need to be right there at the plug.
I would also check that the wiring is neat - rerouting wires can often lessen some of the AC bleed (the 60 Hz hum), I'd even try this with the electronics in my lap, move things around to see what increases/decreases hum.
I'd bet on a bad ground in your cable, though.
Clark Savage Turner
Los Osos, CA.
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