I have been using my iMac 27" as a monitor for my PC and have had no problems with the audio from my HD 6950 working through my iMac speakers via Mini DP. Once I plugged in a second monitor through an HDMI cable the audio stopped working through said speakers.

When I unplug the HDMI cable and restart my PC the Playback Devices option is "AMD Mini DP Output" and there IS sound through the iMac speakers. When I plug in the HDMI cable and restart my PC the "AMD Mini DP Output" option is replaced with "AMD HDMI Output."

Is there a way to have both options, "AMD Mini DP Output" as well as "AMD HDMI Output"? so I can choose "AMD Mini DP Output" over "AMD HDMI Output?

Basically, how do I get the "AMD Mini DP Output" to show up / work again?