Leave the lid open when plugging a MBP into a 30inch?

I play games, watch video & really try and get the most out of my Macbook Pro. When I connect it to my 30inch ACD I usually leave the lid closed... but recently have been opening it once I plug it in, to try and help with heat.
Is this necessary?

Close it. If you leave it open the internal display will be lit and will display something, so you have to set it to Mirroring or Extended Display, but if you close it then the 30" gets the entire video card.
To prevent overheating, put the laptop on a hard surface so that air can flow under it, and do not block the large long vent that spans the entire back of the laptop. Whether it's open or closed isn't going to make as much difference as the airflow through the vent and past the bottom.

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http://support.apple.com/kb/HT1776
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This is so basic, I am embarrassed to post, but here goes. I have a MacBook that sleeps just fine with the lid closed. Light pulses, spin up noise when I open the lid. Recently I have noticed that when I leave the lid open, the screen goes black in the appointed time (from setting in System Preferences), but the little light on the front does not pulse nor do I get the spin-up sound when I move the mouse, etc.
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Thanks for your replies! I have checked my settings repeatedly -- currently (for testing purposes) set for the screen to sleep after 2 minutes, the hard drive to sleep after 2 minutes, hard drive to sleep when possible, etc. Bluetooth is not the problem, set to not wake for bluetooth activity, as is the "wake for ethernet". I have even restarted the computer, left it at the login page, and the behavior remains (no pulsing, no spin-up sound). Now that I think about it, when I close the lid for sleep, the light pulses, but no spin-up sound. Hmmm, should I be worried?
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Details

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Leave the lid open when plugging a MBP into a 30inch?

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