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Then select Displays then select Arrangement.Under the Apple menu, upper left-hand corner select System Preferences.In most cases, choose Duplicate by using the arrow keys or cursor, then press enter. A list of four choices will appear on the right-hand side of the screen. An alternative is to press the Windows key and the “P” key simultaneously.You should now see the exact same image on both your laptop and the monitor or projector in your classroom. If you do see the two monitors and then select ‘Duplicate These Displays’ from the Orientation drop-down menu.If not please repeat the basic trouble-shooting listed above. In the Advanced Display Settings, you should see two monitors shown side by side.When you see the System Page, click Advanced Display Settings in the screen bottom-right corner.Click the Start button in the lower left-hand corner, then click on the System Icon.If nothing is still showing you might need to check the settings on your laptop.If you turned off the projector, you may need to wait a few minutes before the system will allow you to try turning it back on.Sometimes there is too much going on in the background, or too many applications are running. With your laptop properly connected and the correct source selected reboot your laptop.