A friend of mine has a notebook PC, running Windows XP Home. There is a problem with the audio. Everytime the HDD load light flashes (i.e. everytime the HDD is busy), there is an interferance going on which creates, what I can only describe as, a crumpled kind of sound. The notebook has onboard sound and onboard graphics, so I'm gussing this is where the problem lies. Initially I thought that the primary IDE bus might have reverted to PIO mode, since this sometimes causes problems like this (more-so with optical drives). I'm starting to think that it could be an IRQ problem.
The problem has been there from day-one.