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Pending OP Response PC randomly powers off while gaming, RGB remains on

In the past couple weeks, while gaming, my computer has suddenly powered off with no warning. When this occurs, strangely, the PC's internal RGB remains on, while everything else powers off. My fans stop spinning, monitors stop receiving signals, and power button doesn’t do anything until I physically restart my power supply with the switch on the back.

Again, there is no warning for such occurring, the PC just simply powers off and there seems to be no rhyme or reason. I’ve had it occur several hours into a gaming session and only a couple minutes. I have scrolled through my Windows event viewer and found nothing relevant, but then again, I’m not the most experienced with Event Viewer so I could have missed something.

I originally thought this was simply an issue caused by Overwatch 2 (which was the only game that caused this to occur) but recently the issue has been occuring while playing Baldur's Gate 3 too.

I have monitored by temperatures and cooling is adequate (only my GPU's VRAM came anywhere close to 80 C, with everything else stabilizing around 60 C).

My working theory is that my power supply is dying on me, but I’m hoping for alternative theories since Segotep is gonna charge me $20 to ship a replacement.

It should be noted that this only started occurring recently. My PC ran fine for several months prior to this and all of the parts are 14 months old at the most (my GPU, PSU, and game SSD are less than a year old).

Any help would be appreciated. Linked is a parts list. If it’s relevant, I do overclock my GPU, but I had been doing this for months with no issues as previously mentioned and even then I haven’t being doing it “correctly” (I haven’t been undervolting as well as tweaking my frequencies as needed with RDNA 3 cards). I can provide any information if needed.

Thank you!

(I put this in hardware because I’m assuming it’s hardware related. It very well might not be).