won't connect to monitor

Hi, I hope that you’re doing well. So yesterday, I bought an LG UHD Monitor (https://www.lg.com/us/monitors/lg-32UK50T-W-4k-uhd-led-monitor) to replace my old AOC (21”?) 1080p monitor. The old monitor was connected via HDMI, and the new one is running via DisplayPort. I unplugged the old one...

I need some help, yesterday i had recently bought a brand new IBuyPower GamingPC exact model number is the BB971, i do not know if it needs something internal that needs to be connected, but i just connected the power supply and the keyboard and mouse, along with the HDMI cables, Graphic card is...