ASRock B650M-HDV/M.2 LEDs cycling but won't POST

CPU: AMD Ryzen 7 7800X3D 4.2 GHz 8-Core Processor
CPU Cooler: Thermalright Phantom Spirit EVO 69 CFM CPU Cooler
Motherboard: ASRock B650M-HDV/M.2 Micro ATX AM5 Motherboard
Memory: Patriot Viper Venom 32 GB (2 x 16 GB) DDR5-6400 CL32 Memory
Storage: Western Digital Black SN850X 1 TB M.2-2280 PCIe 4.0 X4 NVME Solid State
Video Card: Gigabyte WINDFORCE OC GeForce RTX 4060 8 GB Video Card
Power Supply: ADATA XPG Core Reactor II 850 W 80+ Gold Certified Fully Modular ATX Power Supply

The motherboard LEDs are cycling between DRAM+CPU to Boot+VGA, then all 4 light up and the cycle repeats until I shut it down. Things I've tried include:
- Booting outside of the case on a non-conductive surface
- RMA'd mobo (issue persists with replacement)
- Reseated everything multiple times
- Different PSU with new cables
- Different GPU
- RAM in every slot configuration, together and separately
- Cleared CMOS
- Flashed BIOS
- HDMI instead of DP

A friend of mine has an almost identical build and everything is working normally for him. At this point I assume it must be the CPU, but I'm desperate for any other tips you all may have. Thanks!