I am using mint 14 Nadia on an Acer laptop. My sound would work for a short time after bootup, but 5 to 10 minutes later no sound what-so-ever. I eventually installed pulse audio and all the libraries associated with it and my sound works fantastic. So I would have to say that when I first installed Nadia, the sound hardware was not found and Mint just put in a Dummy pkg that really did not work right. So if this applies to you, install Pulse audio.
@kvnnsz - I hope you get it working soon. http://community.linuxmint.com/idea/view/3844 - I have posted an idea on having a Troubleshotting wizard in Mint for audio related issues. Request you have a look at it and provide your views and if it makes sense cast your vote on it. Thanks