How do I turn off computer monitor when watching DVD movie on TV monitor?

I think this is really a Leopard question because it involves setting up 2 monitors in System Preferences within OSX. 1) I have a wide screen TV connected to my iMac (Intel White Late 2006) through the Mini-DVI port and a separate audio cable. This connection works fine. 2) The purpose of the TV screen is only to watch DVDs using the DVD player and iDVD in my iMac. 3) In System Preferences->Displays->Arrangement, both my computer monitor and the TV screen appear as separate monitors. I have the setting to mirror each other. With this setting, the DVD movie plays on both the iMac computer screen and on the TV screen. 4) FINALLY, MY QUESTION: When watching a DVD on the TV screen, I would like to turn off the monitor in my iMac so that the screen is dark (in sleep mode to save power, etc.); I want only the TV screen to display the movie. How do I turn off only the iMac screen? Thank you. Dale

Dale H. Eckerman Jr wrote:
I think this is really a Leopard question because it involves setting up 2 monitors in System Preferences within OSX. 1) I have a wide screen TV connected to my iMac (Intel White Late 2006) through the Mini-DVI port and a separate audio cable. This connection works fine. 2) The purpose of the TV screen is only to watch DVDs using the DVD player and iDVD in my iMac. 3) In System Preferences->Displays->Arrangement, both my computer monitor and the TV screen appear as separate monitors. I have the setting to mirror each other. With this setting, the DVD movie plays on both the iMac computer screen and on the TV screen. 4) FINALLY, MY QUESTION: When watching a DVD on the TV screen, I would like to turn off the monitor in my iMac so that the screen is dark (in sleep mode to save power, etc.); I want only the TV screen to display the movie. How do I turn off only the iMac screen?
That's impossible. It can only be done on a laptop but not on an iMac.

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