Question Computer suddenly didn't display

[AStarRahimi]

I was working on my PC and suddenly my pc monitor wasn't displaying on my new 165hz monitor. I game on 144hz HMDI using APU only, waiting for Graphics card. I swapped HDMI with my security monitor one and it didn't work. After, I took the cable for my monitor off the socket and placed it back in, and done the same to the monitor plug. I want to know what maybe happened because when I swapped HMDI it didn't work first and my mouse and keyboard didn't light up. After taking plugs out and putting it back on it worked?

Any idea what happened so that maybe I can avoid it?

 

[rgd1101]

full system spec?
include brand and model of the psu

 

[AStarRahimi]

full system spec?
include brand and model of the psu

Ryzen 3 2200G
ASUS PRIME A320M-K
Corsair CV650
UpHere 3 RGB 120mm fans, via SATA Power Connector
1 RGB back fan, via Molex Connector, never had problems with that though.
165Hz iiyama IPS Monito, 144Hz HDMI, used the one supplied in box
120GB SSD Sata
480GB SSD Sata

 

[AStarRahimi]

PC was on when monitor was non displaying btw