This may sound odd, but I had a similar problem with my pros. I thought, because it started almost overnight, that it was my sound card. I took my sound card out and placed it in a free PCI slot. Plugged everything back in, fired it up, and no more static. I'm not sure if it was the sound card, PCI slot, or just a build up in the pros but it hasn't been back and it's been over 4 months. Worth a shot.