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Question Need help debugging failure to boot

May 12, 2020
Known Specs:
MB: ASRock x570 Phantom Gaming 4
CPU: AMD Ryzen 7 3700X 3
GPU: AMD Radeon RX 5700
RAM: XPG Z1 DDR4 (two)

Case briefly opened to remove metal shielding over the I/O ports (case doesn't line up with MB position inside case). Upon reassembly, system now refuses to boot. On power up, CPU and DRAM warning lights turn on and remain on, then the system cycles itself between 10 and 20 seconds later. I have:
-Reseated all cables
-Reseated RAM
-Reseated CPU
-Replaced CPU
-Replaced Motherboard
-Replaced RAM

I am at my wits end, please help me figure out what's wrong here
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