Why can't I close my screen while using an external monitor?

It goes to sleep of course. How can I change this? I'm not seeing anything in the power settings.
Thanks!

Apple Portables: How to use your computer in closed clamshell ...

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Stop the iMac screen while using an external monitor.

I succeeded to play an .avi file in full screen on my 32" samsung lcd...but i would like to stop the iMac monitor while watching the avi. If i choose to stop the iMac monitor also the tv screen became black, and also if i start a screensaver on the iMac this will also appear on the lcd tv evenif i set up the external monitor as an extension of the desktop and not as a duplicate. There's a solution?
Tnx for the answers and sorry for my poor english

That one as well will dim both displays.
I have played around with this off and on for over a year now. The best that I have come up with is in this [Apple Discussion Thread|http://discussions.apple.com/message.jspa?messageID=5587803#5587803]
Sense then I have also found a way to dim the menu bar, but it was a little buggy to use all the time called [MenuShade|http://macapper.com/2007/10/17/menushade-dim-your-menu-bar>
Simply hide everything on the desktop as best you can and use a black desktop or photo image.
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Welcome to the HP Forums.
In regards to your question on known keystrokes to activate external during post, there aren't any. The graphics won't switch to external until after the post.
What you can try, if your able to veiw the BIOS on the external you can run diagnostics from there.
I hope this answers your question. Thank you for posting on the HP Forums.
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Connecting your present two external displays via USB has left your MBP's Mini-DisplayPort available for a third. Depending on the monitor's available inputs, buy a mini-Displayport-to-VGA, MDP-to-DVI, or MDP-to-HDMI adapter and the appropriate cable to make the connection. I would expect that adding a third monitor to your GPU's workload might cause your already slow USB-connected monitors to slow down farther, but you'll have to see whether that's true and, if so, how tolerable it is in your work.
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Why can't I close my screen while using an external monitor?

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