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Hi, there. To be able to turn on the monitor with the connected Mac Mini, make sure that your external display's power cable and video cable are connected securely and correctly at both ends. To learn more about the proper connectivity of an LG monitor to an Apple Mac, kindly visit this link: https://www.lg.com/us/support/help-library/monitor-connecting-to-a-mac-CT10000030-20150911473158. `Al
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