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Normal multi-monitor setup exists in two modes - extended desktop and clone. If you're trying to show the same image on both displays, you want clone mode.
Open Catalyst Control Center (right click on empty desktop space), click Desktop Management, then click Creating and Arranging Desktops. The one with the asterisk is set as primary. You can click the downward arrow on the other to select Make Primary, which will swap them. In the area blow, with the smaller monitor images, click on the downward arrow to open the menu, then select Duplicate to convert the secondary monitor to Clone.