My large monitor is not showing the screen of my MAC airbook on it. All cables are hooked up. I reset the pram  and still not working. Message on black monitor says"check signal cable...?

My large monitor is not showing the screen of my MAC airbook on it. All cables are hooked up. I reset the pram per the instructions I received at the MAC store and the monitor is still not working. Message on blacked out monitor says"check signal cable". All cables are attached and monitor and MAC are both plugged into power source...Help ?

Go to System Preferences, Display. Click on dectect displays.

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