GT 1030 Black Screen When Connected in Mobo
The issue (assuming the the graphics card is working) is that the output of your 1030 is digital (dvi-D)
Your mobo and monitor have VGA which is analogue.
So when you connect the monitor to the mobo it works.
When you connect the graphics to the monitor it doesnt work because your adapter is for for DVI-A or DVI-I which can give an analog signal.
To confirm that watch the GT 1030's DVI output and see with which one of the following it matches
I bet it matches to one of the DVI-D variants.
The solution to that is either to change your monitor (or look if your monitor has other inputs other than VGA e.g HDMI or something else)
Or to get yourself an active adapter e.g https://www.amazon.co.uk/Active-DVI-D-Adapter-Benfei-Female/dp/B07D3XZ9SD (note that it must have "active" in its name to work)
But before that check that the GPU is working by bringing your PC to your cousin and connect it to the monitor or bringing the graphics card and test it in your cousins computer.
But I think it does work since that would also explain why you have to take the card off in order for the monitor to work once you connect the cable back to the motherboard (the motherboard found a working GPU on PCIe and set that as default display adapter if the graphics card would not work it probably would not switch the default graphics to the PCIe but that's not always the case)
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