Pragma, you have deepened the mystery.
I took the speaker cable from my cpu and plugged it into a CD player. I did not, though, move the speakers at all! And I got NO static. What now? Oh, and as for the 3 prong problem, I've lived in this house for approximately 17 years, and it existed at least a few years before that. There are 3 prongs around, but none close to the setup.