My computer has lost its mind and I can't even begin to diagnose what's at fault. (It's the power supply.)

venn177
Tue, 16 Jan 2024 05:08:24 +0000

UPDATE: It was the power supply. I've never even heard of such a weirdly anal issue, but after installing a new one, everything is a-okay.

So, I've never really had issues with power supplies, and generally have always troubleshot (troubleshooted? trouble...shot?) my own issues with no real, well, issues. Until now.

The other day, I got a helluva deal on a 6800 XT on Facebook Marketplace, the guy had the printout with the receipt, it's still under warranty for two years, whole shebang. So I upgraded from a Vega 56 to it. And there were zero issues. Admittedly, my power supply is only 650 watts, so I thought I might be missing some wiggle room there, and was prepared to need to upgrade. But the other night, it was fine. I stress-tested with a nearly-maxed-out 100+ FPS Cyberpunk 2077 and had zero issues, and followed that up with moderate use 144 FPS board games and things for the next few hours with a friend.

And sometime after I went to bed (I left the computer on because I'm a bad man who doesn't take care of his things or some other vaguely acceptable excuse), Windows Update occurred. Again. It's been raising hell on me in the middle of the night any time I leave my computer on, but whatever. So in the morning (this was Sunday), I saw it wasn't working right, and just kind of... shitting itself. Had trouble getting out of BIOS, all this other stuff. Eventually, I realized it was ignoring my SSD, and after unplugging everything else and forcing it to boot from my SSD with the Windows 10 install on it, it said the install was borked and asked me to do recovery steps. None of them really worked. So at this point, I was assuming that I might have hit something with the SSD and damaged the SATA controller when moving the power for the GPU or something.

So today, I got a new NVMe drive, booted from a 16gb flash drive, installed Windows 11 on it, and everything was fine. I was able to create a functional Windows 11 install, and it was fine. Until I got to the login screen. As soon as the screen asking for my PIN (on a complete, 100% valid Windows install) would load, that first frame, it would shut down hard. No BSOD, nothing. Just immediate shutdown. So I thought, "well, this seems like an issue for the POWER SUPPLY!" and removed the GPU, plugging my main monitor directly into the motherboard. Now, it was shutting down and power cycling before it even hit the BIOS, which is... weird as hell? So I thought "well, it gets further when a video card is in, let's put ye olden Vega 56 in and see how far that gets me!" and... it just works. I'm typing this from my fresh Windows 11 install with zero perceivable issues.

So my question is: How is it that my computer was perfectly fine on Saturday night with my new video card under 100% load, but by the next day would decide seemingly at random based on some sort of schrodinger's cat theory when it would shut down and when it wouldn't.

So, in summation, the four inconsistent scenarios, in tl;dr form:

New RX 6800 XT is installed, computer runs fine at 100% load while stress testing and then for hours afterward

6800 XT installed, Windows won't boot and the power supply seemingly gives up

No video card installed, the computer starts power cycling before even reaching the BIOS

My old Vega 56 installed, everything is perfectly fine

So, obviously there's something weird going on with my power supply, but if someone can set my sights on exactly why all of this has happened, and what the proper solution to make sure it doesn't again, or just... I don't know, typing this all out has made the last day and a half of my life feel much more worth it.

And as an aside, my theory for why Windows was broken and I assumed my SSD was dying is as such: When it did the Windows Update and started trying to install it was the first time it powered down with no warning, which just broke Windows mid-update in a bad way.

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