When I am using powerpoint, if I linger too long on a slide the projector looses the signal from my mac. How do I stop this?

I have a MacBook Pro with MacOX version 10.6.8
When I give a powerpoint presentation, if I linger too long on a slide, the projector looses the signal, moves to a grey screen and scrolls through its menu.
I have tried lengthening the time my Mac has before it goes to a screen saver.  It is not that.  Does anyone know how to keep this from happening?
It has happened with multiple projectors.
Angie

http://answers.microsoft.com/en-us/mac

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