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My hp all in one not recognizing external monitor

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Microsoft Windows 10 (64-bit)

HP Pavilion All-in-One - 27-a257c;  I've been using an external monitor but now my all in one doesn't recognize it.  I've done all updates, checked connections, replaced cable, and still not working.  Help please...

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When you right-click on the Desktop and choose Display Settings, it will open a window.  That should show you TWO monitors, your built-in one and the external one.  What are you seeing?

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