Please also try other cables and power wall oulets. Otherwise, as not an expert on very techy stuffs i keen on the PSU issue.
EDIT: Also if you did any kind of soldering lately please revisit this area if you missed any connection. As i am not...
I have no idea if someone mentioned here but i read something lately which is quite valid. Physical disks are not just a serious issue for the PS games but it will trigger a chain reaction of issues. One of the many that made me wander a little...
If i were you, and because you didn't mention anything, additionally, i would remove all usbs & the nvme if added at your PS5. And try to boot again. Usually logos and then turning off, at most systems means a boot sequence issue.
You mentioned...