Mac book pro Retina is not working with vga adapter to video projector

I want to connet to video projectors, With vga adapter i can't connect to the video projector and also my mouse will not work properly, it becomes very slow and I can't work it. With dvi adapter combined with vga, the mouse is fine, but I can't connect to the video projector. Mirroring is my setting. I have tried several video projectors. What shall I do?

Adjust the volume control located in the lower left corner of the YouTube Video Player.

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