Mac Book with Additional Screen

I have mac book with external screen. I have attached cables to screen and have power. How do I get screen from mac book to show on larger screen?

I wonder if you are asking how to get any image on your external screen at all (rather than how to make it mirror your MB). You did not say what connection you are using (VGA, HDMI or DVI), not whether you get any response from your external screen, but the first place to go is to the Displays panel in System Preferences. There, you should be able to see that the external display is recognized and you can select its resolution and position it in relation to your PB screen (or set it to "mirror") if wanted.

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