Sorry to hear about your woes. There is nothing worse than that feeling when a system just suddenly stops working.
A few questions first then some troubleshooting steps:
1. Have you tried bench running the system outside the case? 2. If you remove the memory completely and try to power the system do you get a different code? 3. Have you tried removing all peripherals from the system and powering on? Sometimes USB devices can cause post failure.
Generally when I run into issues like this I try to think first about what could have caused the issue. The system ran fine for a week so it isn't a DOA part. I would assume in a $2500 PC you used a new PSU so that is unlikely to be the cause given the 1300w EVGA unit is a quality product and still powers the system on. Memory typically does not just die so it is likewise unlikely that all your DIMMs died at once. This leaves 2 more likely culprits, the CPU and the motherboard.
Before we look at those though try and strip the system down and bench run it with the bare minimum components needed to post so no HDDs, SSDs, USB devices etc and only one module of RAM which you can try in each slot consecutively. Make sure you reseat your power connections. It may seem like a hassle to pull it all apart but if something is damaged and needs to be RMAd you will need to strip it down anyway.
Now after you have tried bench running it and assuming you still have an issue the next step is to strip it down completely, remove the CPU, RAM and all other cables etc from the board. Once it is all broken down carefully check the pins on the motherboard socket, if the cooler was tightened down too tight it could have bent them over time (a possibility given the PC was working then stopped). Also check the CPU itself for any evidence of burning or warping (unlikely warping but worth looking). If all seems clear, carefully reinstall the CPU and try bench running the system again.
If at this point you still receive the 33 post code then you can RMA the motherboard as it is more likely to be the fault than the CPU. If when you get the replacement back there is still an issue then the CPU is next to RMA.
Hopefully an RMA won't be necessary but at least if you follow the steps I outlined you can be fairly confident that the issue will be resolved after the replacement arrives.
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