How to connect Macbook pro to a projector with the Mini Display to VGA adapter?

When I connect them nothings happens, the display has a blue screenshot for a few seconds and then get back to the normal view of my desktop. It's the same if I digit "cmd+F2"... Please help me.

The default method for adding a second display is called Mirroring. It uses a lowest-common-denominator approach to choosing display resolution, and often guesses wrong.
System preferences > Displays > ( Arrange) and drag the superimposed representations of the two displays away from each other to invoke "Extended desktop" instead. Then you should be able to set the resolution for the projector to a more reasonable one, and your picture should appear.

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