Disable Second Monitor Mac Pro

I have a nice new Mac Pro system with the standard Nvidia 7300 Video card. I connected a second dipslay to it today to watch some videos on my 32" HDTV. However I noticed that the video really suffers when both displays are active in extend mode. The video stutters and I encounter a lot of "image slicing" that is really distracting. I found that if I watch the videos in mirror mode everything is fine. Here comes the question is there a way to disable the seond display when I am not using it? I used to do this all of the itme on my Windows box I could just click disable secondary display and it would turn off and I wold be back to a single monitor config without manually unplugging the seond monitor. Anyone got any ideas?

According to this thread, SwitchResX allows you to do exactly what you're looking for.  It's right on the webpage:
You can disable or deactivate a monitor without having to physically unplug it, allowing you to use a laptop in clamshell mode with external monitor, keyboard and mouse

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