2012 Macbook Pro 15" doesn't recognize VGA monitors plugged into displayport

We have a 2012 Macbook Pro 15" (and a 2010, and a 2011).  The 2012 doesn't recognize VGA/DVI (old) monitors plugged into it, but it does recognize new DVI monitors.
What gives?  I'm not even sure how to diagnose or attempt to treat this.
2012 Macbook Pro
OS X 10.8.3
Wacom Cintiq
Vuzix iWear
etc

Does it see, recognize, any usb devices?
Have you tried a smc reset?
http://support.apple.com/kb/HT3964
If that doesn't fix it and no usb device is being seen by that port then you have a hardware problem and you need to take the system to apple to be fixed before your warranty runs out.

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