Question MSI B550a-Pro CPU LED troubleshooting

[DFace1_2]

The white cpu led on my msi b550a-pro comes on immediately on power up and stays solid. Computer doesn't post, monitor says no input, gpu fans don't spin.

Cpu, psu and case fans are all spinning.

Cpu is a 2 year old 5800x. Whole system was working fine until being moved (by me, in a car, with plenty of cushioning) about 4 months ago into my new flat. Just turned it on for the first time.

What would people recommend as the first steps to troubleshoot?

 

[Lutfij]

Check to see that all connections to your devices from your PSU are all fully seated and secure.

View: https://youtu.be/MYL88wjbmbI

You can try and reflash the BIOS using the above linked guide, with the latest BIOS version and see if that helps revive your build.

When posting a thread of troubleshooting nature, it's customary to include your full system's specs. Please list the specs to your build like so:
CPU:
CPU cooler:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
Chassis:
OS:
Monitor:
include the age of the PSU apart from it's make and model. BIOS version for your motherboard at this moment of time.

Moved thread from Motherboards section to Systems section

 

[DFace1_2]

Thanks for putting in the right section!

CPU: 5800x
CPU cooler: Nh15
Motherboard: b550a pro
Ram: 2 x 16gb ddr4 3200
SSD/HDD: 2 x 1tb nvme pcie 3.0
GPU: rx7600
PSU: seasonic g12 850w
Chassis: fractal design focus g
OS: win 10
Monitor: aoc 24g2