I have a 6 month old Toshiba laptop. The other day I put in a dvd; it made a huge whirring noise (this might be totally irrelevant btw) and since then, when I play sound on my laptop, it crackles. I recorded myself on Audacity and that came out poor quality too. I'm not very good at describing it but obviously something has gone wrong. Would it be a damaged soundcard? It's bound to be under guarantee so that's not an issue but I would like to know what the problem is.