I think you may just be missing one setup step.
When an external display is connected, QLab will show the displays in workspace preferences as they are defined by the system preferences.
Make sure that the screen you are using for your video cues (e.g. Screen 1, Screen 2, etc.) is patched to the new display.
See here:
http://figure53.com/qlab/documentation/videocue.php#preferences
Once it is patched it should play on the assigned screen.
Best,
Chris
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