Audio Issues Using iMac 27 as Monitor, after Yosemite

Folks,
I use the Mac as an external monitor for my PC. I've been playing music from the Mac on external speakers, in both Mac & PC mode for 4 years. Since Yosemite, when I switch to the PC, the speakers change to the internal built-ins. When I select the external speakers the 'Settings for Selected Device' says 'The Selected Device has no Output Controls'. It's connected via USB to an Audioengine D1 DAC and 5+ speakers.
Any thoughts? I never had any issues before Yosemite, and there seems to be no way to lock the setting to external.
Thanks...

Unfortunately the rep in the store was not correct. This feature is called Target Display Mode, Apple discusses it in the Target Display Mode 2009 & 2010 iMacs & Target Display Mode Mid 2011 iMacs articles. As you will read in the first article you could do this with Mid 2009 & 2010 iMacs but not with 2011 models because they use Thunderbolt. However if you got a new MacBook Pro or MacBook Air which also have Thunderbolt in 2011 then you could use the 2011 iMac as an external monitor to either of those models. In short you need Thunderbolt on all the connected computers.
The good news is there are still 2010 iMac's available in the Apple Refurbished store. If you have never experienced the refurbished store then you not be afraid, these machines have the same 1 year warranty as a new machine and are also eligible for AppleCare. Almost everyone that gets one cannot tell the difference between a new machine and a refurbished machine, they're that good. You can only buy them from Apple's online store, to check what is available check frequently because inventory can and does change from hour to hour.

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