Trouble connecting to projector, Precision M6400 and M4400


I am unable to connect my laptop to a projector using a VGA cable.  When I press the Fn + F8 keys the menu pops up to change the display output but nothing happens.  I've tried right-clicking the desktop and changing the settings but it doesn't recognize a second monitor.  I've also tried reducing the screen resolution.  I've tried these steps with presentation mode both on and off.  Any assistance is greatly appreciated.


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