I want my MacBook open and its screen dark when connected to Cinema Display

I have a c. 2009 MacBook Pro running OSX10.8.3.  When gaming I want to use my Cinema Display (only) with the MacBook open and its screen dark, in order to facilitate cooling and conserve video card resources.  Is there any easy, safe, reliable, non-technical way to accomplish this?? I have searched the Web and found everything from using a magnet to reprogramming to using Hot Corners.  Using Hot Corners seemed to have good potential but I can't seem to make that work.  I don't want to reprogram my computer whenever I disconnect it from the display.  I am afraid a magnet is not good for the computer.  And I really find it hard to believe that something this basic should be impossible!

Hi Squiji,
Turn the brightness control all the way down
does that count as an easy, safe, reliable, non-technical way?
Another nice trick:
ctrl+shift+eject
instantly darkens your screen to black.
You can return to normal brightness by pressing any key or the trackpad.
very handy when somebody like your boss unexpectedly comes in, and you don't want him to see your 'confidential information' :-)
Don't know how this behaves with a second screen attached though, I assume that goes black too but you can try it.

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