ASRock Error Code "16"

I am new here and from germany. do not yet know exactly how to ask properly in such a forum. Please forgive me.

I have since yesterday a problem with my PC. It starts with a blackscreen and my monitor gets a short time an signal but then it turns off again.

My PC Specs:

Mainboard: x370 k4 gaming
Processor: Amd Ryzen 1700
Memory: G skill Flare x 2x 16GB (for Ryzen)
Graphics card: gtx 1070 quick silver
Power supply: 1000 Watt (is exaggerated but that's not the reason.)

Now when I start my PC, a few codes run through at the Dr. Debug display. But this is normal at startup.

Before the display hangs at code "16". my PC hangs briefly at code "55".

I also looked on the internet what these codes mean. According to the associated code explanation is something with the CPU or RAM. I have removed the CPU and reinstalled it as it is specified and deleted the CMOS.
I also put the RAM modules in different slots to see if it works.
Unfortunately it did not work. Then I used a new RAM module and got the same error.

I had the idea that the RAM has problems to load the operating system from the main memory. But then I would get into the BIOS. But even with the SPAM of F2 I could not open the Bios.


After that i tried to use my components in another computer. But theres everything all right an the computer starts without any error.


Now I'm at my wit's end and ask here.

Thanks in advance!