Question My newly built pc won’t connect to my monitor

Oct 11, 2019
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I’ve had this pc sitting on my desk for the past 3 weeks. I’ve tried everything from the weird tricks of powering on your pc then monitor etc. I rebuild the pc 3 times. I took out the motherboards battery for some sort of reboot. Yes I have it plugged in the gpu not the mother board. I got this pc from this video
View: https://youtu.be/sizFVelqjXw
. Please I am extremely desperate here, all I wanted to do is making some YT vids.