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I finally figured this out myself. I had a audio device in my device manager (NOT MY PLAYBACK DEVICES) that was not enabled. It was under the "System Devices" section. Once enables I could select "Digital Display Audio" in my playback devices. I hope this helps anyone else having this issue. I'm running Win7 64-bit.
This was BIG HELP!
I was searching, unplugging, pluging, surfin the forums only finding Apple related issues. Its like people don't know Mini-DP carries audio.
I started to think this aswell after switching a couple of adapters I own back n forth and restarting the PC like times with Realtek driver installs.
And then I found your post.
Thank You, made a account literally to thank you; it was the fix I was hoping for.