@lflashbdx
This motheboard?
https://dlcdnets.asus.com/pub/ASUS/...WEB.pdf?model=ROG STRIX B550-F GAMING WIFI II
Do verify that I found the applicable User Guide.
Review and reread the entire Guide paying close attention to all specs, supported components, supported configurations, fine print, warnings etc..
Make notes as you go regarding your system, Look for differences. If there are differences then be sure that the reason for any given difference is known and understood.
For example: the installed RAM and the RAM slots being used per Pages 1-5 and 1-6.
(Note: some motherboards require that the first physically installed RAM be placed in a specific slot - commonly DIMMA2. Does not appear to apply to your motherboard - be sure to confirm if or if not that is an installation requirement.
Go to ROG's website to check for more updated information.
Also not uncommon that there is a "loose" connection somewhere., What appears to be fully and firmly in place is actually not. Unseat and reseat all connectors, cards, RAM, jumpers, and case connections a few times. Something that seemed ok may suddenly go more smoothly and firmly into place. Do leave the CPU alone for the time being.
As a matter or elimination, I suggest resetting the CMOS battery per Page 1-17. Note the warnings at the bottom of the page. E.g.: "
Short circuiting or placing a jumper cap will cause system boot failure".
Likely no harm in installing a new , fresh CMOS battery as well.
Start over/"do over" as if it all was your first build. Take your time, read carefully, check and check everything, look for possible shorts (I/O panel and elsewhere) and signs of damage. Cracked connectors. Case connectors can easily get mixed up cause problems.
Work in a clean well lit area with the proper tools. Do not work if tired or stressed. Be very deliberate and do not move on if a problem is encounted. Resolve that problem first.
The overall objective being to ensure that there is not some simple error of omission or commission.