BIOS stuck in loop, no boot, cpu led on mainboard on, halp pls :/

Mar 20, 2018
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Well, hello there! i am terribly new to forums, but i hope i did ok enough..
i did read through some topics around here, but i did not find that exact problem.

I've build a new system with these components:
- 600w psu
- GA-AX370_Gaming-5 Mainboard
- Ryzen 7 1800x
- corsair vengeance Ram 16gb (2x8gb) 3200MHz (fitts for the mainboard)
- Dark rock pro 3
- gtx 970 palit jetstream
- samsung ssd + 2 wd blue 1tb

So the System worked just fine, did a bios update to i belief f22b which was the latest available for my exact board. So far, no Problems.

One week ago, suddenly it just won't make it through startup. everything is turned on (fans leds graphics card), it cycles between something called "Phase transfer to BDS from DXE" to "Pre-Memory North-Bridge initialization is started". and it does that continuously. no nothing appearing on screen. no end in sight.

whilst this it would go through the leds for CPU, DRAM, VGA and BOOT. but now it stays at CPU and sometimes jumps to DRAM and back.

but it doesnt end here. i got the option to switch to a backup BIOS. i did that and it did boot just fine, i used it for the last week now, not worrying too much about what has happened, searching not too hard for a solution. but now i got the same thing with the backup BIOS.. :(

i tried clearing the CMOS a couple times, even removed the battery and power plug for a day.
i removed the power cables from the mainboard, the cpu, the ram.
i tried booting with just a single ram stick in different places.
nothing.

same thing all the time and i just dont know what to do now..
since it worked when i switched to the backup bios, i dont think that it is the cpu, since it worked just fine.
but what do i know, i am not that into mainboards...

Id be very happy if you could give me any further suggestions or advice for me!
(exept for my spelling or choice of words, since today isn't the best day for my english xD )