Nvidia issues?

Hi all, I've been having more and more trouble. I came here for some help with Bazzite, which ended up being solved or so I thought. I got to play Elden Ring for a few hours after which I turned off my PC. Everything ran perfectly smoothly with absolutely no issues. The next time I turned it on, the hard freezes started back up.
I thought it might have been an Nvidia driver issue or an issue with Plasma, so I tried just about everything I could find to no avail. The next step was to see if reinstalling from the installation media would work, no boot. Tried again, no boot. Tried switching to bazzite gnome, no boot. Tried switching to Pop OS and the installation media won't boot.
Every time, the one of the two same things happen with all of these attempts: a flash of artifacting, then a hard freeze, sometimes with the artifacting stuck, or everything but the cursor freezes for ~30sec then it freezes too. Both scenarios require a hard restart, but then the same thing happens.
One useful price of information is that Tails works flawlessly, I run it on occasion from a USB (lately moreso to look things up because it's my only way to use my PC since this has been happening).
I've checked that my GPU and drives etc are seated properly, all seems fine on the hw end. I'm at my wits end and I don't want to go back to windows. I clearly have a lot to learn still, but I never expected this to end up as difficult as it's been. Does anyone have any suggestions for me? I would love to be able to play Elden Ring, but at this point I just need a working system other than Tails.

Botzo ,

I had a similar issue a couple years ago and it turned out the power supply just couldn't handle load well anymore.

Obviously I can't make that a definitive diagnosis, but per Cunningham's law, it should help get a better answer for you.

mushroomstormtrooper OP ,

Well that really could be it. My power supply is the only part in my PC that's still original other than the cd drive. I'll dig around and see if I can find a way to check it before spending the money on a new one.

Ghoelian ,

Should be pretty easy to test, just run a GPU benchmark for a while and see when it fails. Ideally on an os where the drivers are known to work well though, which unfortunately is pretty much just windows

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