Im having the same problem.Did you ever find the solution?
no i did not. nobody has really been helpful, anywhere.
i posted another meessage on the microsft website. they basically said, before we're able to determine its a hardware problem, we need to check if its a software problem. they asked my to update my bios. i have absoloutely no idea how to do that and i was told to go find someone who does. well i cant afford to have someone fix this issue for me. especially considering i have already found a manual work around. I have an external audio driver that alows me to run analouge cables through the output , which i conected to one of those headphone jack outputs (the smaller ones) which i then plugged into my tv
I dont know if there will ever be a soloution to this.