Line Filters
A friend of mine and myself had the same problem with 4 laptops. Bought line filters at Radio Shack for ALL 4, the noise stopped. They are a small barrel type filter with chords & RCA plugs on both ends, plus an adapter to go from the laptop headphone jack to the RCA's on the filter line, which then goes to the mixer. Really reasonable in price, simple, and they work! Seems like if the 3 to 2 plug at the wall socket doesn't work, you need to isolate each problem, at least that's what we find.
TKaraoke
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