How extra screen working with cover MB Pro closed

I have a MacBook Pro a1229 17" running 10.6.8 ,
Extra screen : Apple Cinema HD Display 23" ,
wenn i close the cover from the powerbook , the extra screen is also going to sleep .
How to override this ?
Thanks ,
Bob ,

Hello Roborny,
Based on your post it seems you would like to use your MacBook Pro while closed, and connected to a secondary display. I have linked to an article which provides the conditions that need to be met for closed clamshell usage:
Mac OS X 10.6: Using your portable computer with the display closed
With some portable computers, you can use your computer with the display closed. For example, you might want to close your computer’s display when using it to give a presentation on an external monitor connected to your computer.
To use the computer with the display closed, you must connect it to an external display, keyboard, and mouse. The power adapter must be plugged into the computer and into a power outlet.
You can also use a wireless (Bluetooth) keyboard and mouse. Make sure to select “Allow Bluetooth devices to wake this computer” in Bluetooth preferences. Click the Advanced button in the lower-right corner to access this option.
To operate your portable computer with an external monitor attached and the display closed:
Connect a Universal Serial Bus (USB) keyboard and mouse to your computer.
Connect the power adapter to the computer and a power outlet.
Close the portable display to put the computer to sleep.
Connect your computer to an external display.
Wait a few seconds and then press any key on the external keyboard to wake the computer.
Thank you for contributing to Apple Support Communities.
Cheers,
Bobby_D

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