it may have something to do with ur laptop screen and the pickups....and how close they are to each other.
Fender '51 Precision Bass
Hofner Verythin LTD Edition Guitar in Walnut w/ Bigsby
Engelhardt ES9 Upright Bass
1968 Trayner YBA 1A MK II Amp
w/ 6x10 cabinet

Is it when you play the guitar it makes like a really terrible sound, or without even playing it hums?
Duke Ellington - If it sounds good, it is good.
Have you tried plugging the power supplies for your Toneport and your laptop into the same plugboard?