You probably need to get into the BIOS and disable the mobo's onboard graphics.
First thing to do would be to remove the graphics card and make sure that the monitor works with the on-board (motherboard) VGA connector.
To get into the BIOS/setup, check the screen as the computer starts up and see if it says something like "DEL to enter setup". The key may vary - it could be DEL, F1, etc. - and the BIOS may be referred to as BIOS or setup or settings or some-such. Check the manual to be sure.
Once in the BIOS/setup, navigate to where the onboard graphics is mentioned and set it to "disabled", or in some cases, "auto". Turn of the machine, reinstall the graphics card, plug the monitor into the graphics card's connector and...... with any luck.... viola!
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