You may get an error message on your screen if you have connected the monitor to the wrong port on the computer or you may even get no display at all.

Please ensure you have connected the monitor to the VGA port on the dedicated graphics card and not the onboard VGA. Please see the photo below with the red arrow where to connect the monitor cable.

If your PC has a dedicated graphics card such as a GT 1030 or GTX series you will not have a VGA port and will need to connect the monitor either via HDMI, DVI or DisplayPort depending the actual graphics card installed.