Question PC shut off, now won't post, error code 90

Aug 20, 2019
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Hey guys,
I recently built a new system:
Aorus x470 gaming 7 wifi
Ryzen 3900x
5700xt
32g Gskill trident 3200mhz
WD Black 500g m.2 nvme

Everything was working fine last night and have been gaming on it all week. After a match finished last night the PC shut down as if it flipped the PSU switch. After restarting it the motherboard debug led for the DRAM was lit, reseated the RAM and now it's showing the VGA led lit and post the error code 90. I reseated the GPU, removed cmos battery/held cmos reset button with everything disconnected, and checked all connections. I'm at a loss. Everything is lit up, fans blowing, water pump is working fine but it still won't post. Any advice?