Newly built PC won't display screen

Sep 29, 2018
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Hi, I just built my first PC:

MOBO: ASROCK B450M Pro4
Ram: vengence 3000 ddr4
CPU: ryzen 5 2600
GPU: 1050ti

My monitor is connected directly to the VGA socket on my mother board rather than the GPU because I am still waiting on my HDMI cable to arrive.

When I turn my desktop and monitor on, my monitor doesn't show anything. Is that because I have a GPU connected to the mobo, and therefore, I need to connect directly to the GPU rather than the mobo? Or is it because I screwed up somehow?

Thanks for all the help.