How do i keep my display from going to sleep?

I cant figure out how to keep the display from going black on me when I am connected to my lcd tv and am watching movies through the macbook pro. I have tried to change everything related to the display but to no luck. It just goes black after 20 minutes or so on the lcd tv. It is fully connected to a power source. Any ideas?
thanks
C

You've tried setting System Preferences > Energy Saver > Sleep tab > "Put the display(s) to sleep... to "Never" - all the say to the right?
If nothing else, you can use a 3rd party app like Jiggler to keep the display active:
http://www.sticksoftware.com/software/Jiggler.html

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