Question CPU EZ Debug Light

[Bill-X]

Hi guys,

My nephew's PC turns on (fans spinning, RGBs working, GPU light on, monitor and HDMI cable perfectly fine), but it doesn't post and the motherboard's EZ Debug LED for CPU is constantly on. I already ensured that every single connector and cable was plugged in firmly to the correct slot/socket, confirmed that no CPU pin is bent (even reinstalled the CPU with new thermal paste), had the 2 RAM sticks swap slots, did several BIOS resets, and replaced the CMOS battery with a brand new one (old one died on me while troubleshooting). What other remedies or steps can I do to possibly fix this issue before deciding to replace the CPU (and/or motherboard)? If it helps, here's the build:
Mobo: MSI B450M PRO-VDH PLUS
CPU: AMD Ryzen 5 3600
GPU: XFX AMD Radeon RX 570 RS XXX 4GB
RAM: HyperX Fury 2666MHz 8GB x 2 DDR4
SSD: Colorful CN600 256GB M.2 NVMe PCIe
HDD: Seagate Barracuda ST1000DM010 1TB SATA
Cooler: Thermalright Assassin Spirit 120
Case: Inplay Meteor M30 mATX
PSU: (something) 600W Non-modular

Thanks in advance for your help and guidance.

Bill-X

 

[Lutfij]

PSU: (something) 600W Non-modular
You should clarify what the make and model of the unit is. Please include the age of the unit as well.

See if you can drop your processor onto a known working motherboard(with the right BIOS version on it) and see if the same issue crops up on said donor platform. Your motherboard doesn't have a BIOS flashback or recovery option, which is why you're relegated to sourcing(borrow, not buy) spare parts to troubleshoot.