seems that maybe trying d.i. boxes with a ground switch might be a good way to go. we have had situations where there's been no hum, and thinking about it, they were a while ago before we were using the current desk and therefore were sending the laptop directly to the foh mixing desk. maybe the times it worked fine was because we were going into d.i. boxes.
do you have time to come over during the week? because i know it hums out in my studio, so i can borrow a couple of d.i.s and we can test it out there to see if it works. apparently an external soundcard might also help, but that's a much more expensive option.
i don't think the positioning of the power supply in our case is relevant. it's happened often and with the power supply in all sorts of positions.
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