Since you appear to be testing the USB ports, I have to assume you are connecting an external monitor cable to an adapter that then plugs into a USB port. If that is the case, we can not help you as nearly all such arrangements will not work.
I did such a connection and had to go through three different model adapters until I got one that came with its own drivers -- and only THEN did it work.
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I use hdmi to vga converter for that in which I connect hdmi port to my laptop and vga cable from monitor to converter but laptop detects my monitor but unfortunately not displaying anything on moniter means black screen.
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