I presume the VGA cable is OK and the external monitor is good.
On the "F" keys, (function Keys) at the top of your keyboard, one will have a diagremme of a laptop next to an empty screen, maybe F5, press and hold the FN ket whilst pressing the F5 key.
That will toggle between internal, both and external monitors.
For more information, go to the Dell website and download as required.
Hope that helps.
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