Cannot play the video in powerpoint when connected to projector

i have linked a video into a powerpoint slide... it played perfectly on the screen. but when connected to projector it cannot be played.
i am using a macbook pro with Lion OS.
Thanks!

I had the same problem today in front of an audience with 300 people (MacbookPro OSX 10.10, Thunderbolt-VGA adapter, PPT 14.4.6).
Here what I figured out so far:
1. It happens when you have PPT open and connect to beamer afterwards
2. You can resolve it (in my case) by quitting PPT and launching it WHEN connected to beamer
3. Yet, make sure Mac does not go into sleep mode or you get a lock-screen in the waiting time. if you do so, you get back to square 1. quit PPT again 2. restart it.
4. Also.... in one case I had to hit the volume control once to get the sound back even though movie was playing
So in short: Connect to beamer first, then launch PPT
I know it is only a symptom fix but it worked for me

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