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Macbook Pro's do indeed support the use of an external display while the lid is closed.
Requirements in order to do this are:
- Plugged into AC
- External display must be connected and working prior to closing the lid
- An external keyboard, mouse, or trackpad must be connected.
After your Mac's Desktop appears on the external display, close the computer's lid.
In OS X Lion and later, the external display will change to a blue screen, then will show your desktop.
In Mac OS X v10.6.8 and earlier, wake the computer up by clicking the mouse button or by pressing a key on your external keyboard.
NOTE: For best results it is recommend that you put your computer to sleep before disconnecting your external display.If you continue to have questions on this topic, just reply back to this discussion. I will be more than happy to work with you further. Hopefully, this info will answer your question
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Thanks and good luck,