Put one out of 2 displays to sleep?

I have 2 displays, my main computer display 23 inch Cinema Display.
And 40 inch samsung LCD-Tv.
I would like to be able to put my main display to sleep when I watch a movie on the LCD-TV.
If I power off my LCD-TV it disappears and only computer display is active.
If I power the LCD up both displays work.
How can I power down the computer display without unplugging the cable?
Or atleast make the screen go dark, like sleep mode?

Interesting. Just for my knowledge, did you check In the display control panel there is a tab for options. See if you can check for having the side button turn the monitor on/off. Because of the DVI-ADC converter it may be possible that you do not have this option.

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