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VGA port stopped working

ProBook 3JJ41UT
Microsoft Windows 10 (64-bit)

I purchased a ProBook 3JJ41UT on 8/26/18. I have been using the VGA port for a second monitor until yesterday when it stopped working. If I right click on the desktop and click 'Display Settings' it says 'Didn't detect another display'. 


I have tried another laptop with the same cable and monitor, that one works fine so that seems to isolate the problem to this laptop. Anyone have any suggestions to diagnose the problem?

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