My computer speakers have started crackling and popping like it is amplifying static. I haven't blown the speakers, because I have tried several different sets of speakers and gone through my stereo. All setups have the static. It seems to be an issue with the sound card or the computer. It isn't any of my wires to the speakers, as I have gone from the sound card directly to the speakers. Could it be static electricity from the winter being so dry? I've never experienced this in the winter before though. what can i do to diagnose and fix the problem? Thanks!