My wife's comp has a pair of Logitech z625 speakers. They sound fine, but they're afflicted with obnoxious potentiometer scratching that I can only briefly subdue with Deoxit. Is there a better fix?

There could be quite a few reasons your laptop has no sound or your headphones sound bad, but this is a different problem entirely. If your PC isn't playing sound from the correct source, there's a ...