New PC freezing up randomlu

[Jsun96]

So I've just built a new PC for myself. Was all happy and all before encountering a few problems. Here are the specs:

 

Case: corsair 5000d airflow

Motherboard: asus tuf x570 plus wifi

CPU: ryzen 5800x

GPU: evga ftw3 3060ti

RAM: corsair vengeance rgb 16gb (8x2)

PSU: corsair rmx 850

M.2_2 SSD: samsung 980 pro 1tb

Sata_1: Seagate barracuda hard drive 2tb

Have a total of 10 fans in the case but to separate fan and rgb headers

 

All I did to the settings before officially booting it up was changing vvdcr core voltage to offset mode, and typed in -0 1, that was it. Then I installed windows (unactivated) from a USB drive, didn't make any changes either. It was after i downloaded steam and started downloading apex from it that things started to get weird.

 

I was downloading apex from steam, DaVinci resolve from the web and watching YouTube videos at the same it froze for the first time. I rebooted it. Happened again, this time while I was importing files from my external ssd drive. And later it happened a third time...

 

Just wanna ask does anyone know what might be going on?

 

Ps. Another problem is that I can't seem to power the machine on with the power button of the case. I'd have to press the reset button to boot it. Have I connect something wrong?