i forget to mentioned the 55 error in the motherboard display.
Hello I had the same problem. Error 55 and a boot loop. I could not solve the Problem, so I send the Mainboard back and hope to get a new one.
My system was running for one day, and then stoped working. First the Error was FF and it never reached BIOS start. Than it changed to Error 55 after I disconnected everything exept for CPU, CPU-Cooler and RAM (I tryed every DIMM Port), but the problem was still there.
Some Professionals in different forums wrote me, I should give the Mainboard back.
I hope, this solves the Problem.
Good luck for you.