Upgraded CPU - now nothing turns on at all.

[Artemis Kazuto]

Hello, 

 

I recently upgraded my CPU from a Ryzen 7 3700x to a Ryzen 7 5700X3D. 
 

The CPU swap went smoothly but when I plugged in the computer to test it out, nothing would light up or boot at all.  As if the computer had no power.  
 

I removed the CPU and with no CPU installed it boots fine (as fine as it can without a CPU). 
 

My kicker is even when I reinstalled the 3700X it still wouldn’t boot. 
 

Flashing the bios didn’t resolve it.  It’s not a power button and the PSU is working. Same issue after isolating other components.  
 

Could I have broken the Mobo somehow? 
 

CPU: AMD Ryzen 7 5700X3D 8-Core Processor
Motherboard: MSI MPG B550 GAMING PLUS ATX AM4 Motherboard
Memory: Corsair Vengeance RGB Pro 32 GB (2 x 16 GB) DDR4-3200 CL16 Memory
Storage: Samsung 970 Evo Plus 1 TB M.2-2280 PCIe 3.0 X4 NVME Solid State Drive
Storage: Western Digital Blue 2 TB 3.5" 7200 RPM Internal Hard Drive  (Salvaged from previous PC)
Video Card: NVIDIA Founders Edition GeForce RTX 3060 Ti 8 GB Video Card
Case: NZXT H510i ATX Mid Tower Case
Power Supply: Corsair RM850x (2021) 850 W 80+ Gold Certified Fully Modular ATX Power Supply
Operating System: Microsoft Windows 10 Home Retail - USB 32/64-bit  (Carried over from previous PC)
Keyboard: Logitech G915 X LIGHTSPEED RGB Wired/Wireless/Bluetooth Gaming Keyboard  (Just upgraded)
Mouse: Logitech G502 LIGHTSPEED Wireless Optical Mouse
 

Thanks. 

[--SID--]

Motherboard BIOS needs an update. Update to the latest stable version. https://www.msi.com/Motherboard/MPG-B550-GAMING-PLUS/support

You can update without a working CPU https://www.youtube.com/watch?v=K5aFhNh_u4U

[Artemis Kazuto]

Ended up putting a new Mobo in it and that fixed it, unfortunately.  
 

Tried to update the bios and it flashed successfully theee times, but no improvement. 
 

my only guess is I messed up the cpu socket somehow.