Hmm never realised laptops were wired that crappily for audio purposes, or even just general power I would think they might be a bit better wired at any rate, I would have thought things like that would affect the stability of the computer if I am guessing how it happens correctly internally in the laptop. I am wondering now if that is what is supposed to set apart the Ozma-M if they have already accounted for that(Doubt it though
Yea I can see how it might happen, I dont know enough about electrical theory yet to be able to guide you through modifying a laptop to fix it, nor would I really care to on anyone's but my own, however yea lifting the ground on the audio side of things should help with the problem.
Cant believe how many people I saw recomend a DI box to lift the ground though, I would almost swear that would screw with the impedances and just cause more noise to be induced into the system.
Yea get a ground lift, and dont get it from Radio Shack, there should be more than a few manufacturers out there that sell them. Try it and see if it works, the lack of a hum(Even on those SoS forums a hum/buzz was the most common symptom) may be just the fact it is a laptop, but could also indicate it is a different problem internally as well.