Yup. They are all running the onboard Sigmatel HD audio which I believe is no long being developed, but I am running the latest version of the driver for both machines as I've already gone over that in my troubleshooting. I can surf the net to see if there is one that was released before they sold out, but as far as I'm concerned it is the latest driver. These are all Dell machines as well. Mainly the XPS 400 series (so 400 410 and 420s). It's not a big deal, but I for a second I thought I was just hearing things in my head until I did the same steps again and heard it again. And it is the only thing that is doing it. Just found it weird and wondered if there was a fix for it possibly besides going through the mess of lowering the hardware acceleration which I think would be uncalled for in this case.