IMac External Displays...

10-11  Source: Network gathering  Views:1 

I have a late 2009 27-inch iMac and I am wondering how to turn off External Displays.
My problem is that when I use Media Composer 6 software, some of the windows are being moved to a external display and I am unable to see them because I do not actually have a second monitor.
I have a Sony 5.1 Ch. Home Theater System plugged into my MiniDisplay Port via a MiniDisplay to HDMI cable.
So, my question is, how do I turn off the external display without turning off my Surround Sound System?????
Any help is much appriciated.
Had the same thought as rkauffman, wondering why you are using mini display port. But if for some reason you have to keep doing that, this is from Media Composer's help page answering another problem but it mentions turning off an external monitor, so there must be a software setting to do so.
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