Question Partially unresponsive PC ?

Nov 28, 2021
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hi everyone
i've been facing a lot of hardware issues ever since I built my PC June of 2020. Not even a year into having my PC and I had to replace my RX580 during this horrible market
Nevertheless, I'm facing another issue.

So as of today, my PC blackscreened twice w/the fans blasting. I had to restart my PC both times to fix the issue. A few minutes ago, I left my PC for a few minutes and I come back to both my monitors off, my CPU and case fans off, and the RGB from my GPU light off. I know that my PC is still receiving power because my GPU still has one little white light on when this occurred. I'm really hoping I don't have to replace another part, because my wallet is hurtin'. Any suggestions at all? Is this a motherboard or PSU issue? Thanks for your time

Specs:
AMD Ryzen 5 26000
MSI B450M Micro AXT
Corsair Vengeance 16gb (DDR4-3000)
Coolermaster Q300L
Montech 850w fully modular psu