One more thing,, try pushing the function key.. bottom row left side, holding it down, and then push the F5 key once.. not only does this activate the external monitor port but it also reactivates the laptop screen in case you accidently turned it off. Usually that key combination does the following with each push: changes the setting from laptop screen only to dual monitors.. laptop screen and external monitor screen; then laptop screen off and external monitor only, then back to laptop screen only and no external monitor.
Good luck.
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