Main screen OFF, while External Screen ON

Hi,
How can I turn my iMac's main screen completely OFF, when I'm watching a movie on my external 1080p TV, so the iMac won't dim annoyingly next to it?
please skip "cover with", "set background", "lower brightness", "turn iMac", "crackopen iMac" and "why do you get an iMac if.." answers,
I'd like the main screen absolutely OFF, while the stuff runs on the external screen..
there has to be a solution for this basic function in OSX, it's 4-5 clicks in Windows, but I'm an Apple newbie..
Thanks in advance for your answers!
Steve

No you can not just turn off the iMac's display.
Everyone here in the Forum is a Mac user just like you, if you are annoyed or discontented please contact Apple > http://www.apple.com/contact/
There is a third party Utility called Shades that will independently dim either Display to black in Extended Desktop Mode. > http://www.versiontracker.com/dyn/moreinfo/macosx/31515

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