Running decade old parts (or older, in the case of that PSU) in a hotbox with most of the fans disconnected and no thermal paste? This thread is a perfect demonstration of how to torture hardware until it breaks, though it does sound like most of it is broken already.
For an RX570 and FX processor you are going to need:
- A NEW modern 80+ power supply. Not used and abused from facebook/craigslist/ebay. In my experience, a lot of used PSUs are often being flipped because someone's system is unstable and they suspect the PSU may not be good enough.
- A case with unrestricted intake/exhaust fan bays and all fans working at >1000RPM under CPU and GPU load. You probably only need 1 intake and 1 exhaust but that case looks completely unsuitable. The holes you've drilled have changed it from "completely useless" to "still completely useless". If you can't change the case, cut out a huge hole in front of the fans so that there is NO plastic in front of the fans at all.
- Thermal paste. It is never optional.
- The patience to test each component one at a time.
I don't know how much you paid for this but you said in your other thread that it was only 6 months old. The newest thing in there is from 2017 and some of it is probably 15 years old and was likely found by a recycling company and then resold on facebook/craigslist/ebay. I throw out stuff better than that every day because it's no longer worth selling and even if it works, it doesn't have much lifespan or relevance to modern computing.
What is your budget for trying to get this working? You're in the US so you should be able to get parts ordered from reputable places at decent pricing.
I mean, I'd start by getting a stable platform you can build on - so a motherboard that isn't a decade old and that hasn't been cooked for the last six months. Pair that with a decent 80+ Gold certified power supply and throw in stopgap CPU (that's still vastly better than your FX-4300) and 1x8GB to get you up and running (with room to upgrade to 2x8GB if you have budget later).
pcpartpicker.com
Use that stable platform to test whether your RX570 is actually okay or not, and whatever you do, don't risk ruining new hardware by connecting any of it to that PSU. Any damage to your current hardware is likely to be the fault of that nasty PSU you're currently using. The case should be fine as long as you're happy to either run with the front panel off entirely, or cutting out much more material.