The CPU indicator light is illuminated on the motherboard and remains active.
The CPU indicator light is illuminated on the motherboard and remains active.
I don't understand what it is, but I've experienced quite poor fortune with MSI B550 motherboards. Even when they function well, I tend to encounter faulty ones more often than expected. You might want to check if the board itself is defective—could you ask a friend who has a CPU you can lend? Also, note that the CPU voltage indicator sometimes activates when the RAM is faulty. Try using less RAM to see if the issue persists.
It seems the motherboard might be involved again. Previously, that was the issue. The CPU could have failed too, but that's less probable. Still, testing the setup separately inside the case is really useful!
the motherboard contains many parts, but just because it lights up doesn't guarantee it works properly. @YoungBlade had a valid observation. Devices connected through PCIe directly to the CPU, like the main PCIe port and the first M.2 slot, might be causing the problem.