Chris Green wrote: "One thing I had fun diagnosing ( and I'm glad that I did was my machine wasn't properly grounded. The outlet I was using [had the] ground prong ... improperly wired so I got [a] nice loud hum when I'd hook my computer into the stereo mix. Making sure to use an outlet with proper grounding and all was good."
One way you might test this is with a multimeter: first read the ACSafetyRules, then see if there is any AC voltage between the ground pins of two different outlets (there should not be), and then see if there is any resistance between them (there should not be, not even at the lowest resistance setting). --slinkP
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