Question bootlooping since crash without bluescreen, but succesful POSTing (video included).

Jan 19, 2021
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I upgraded from an i7 6700 with H110M Mainboard to a Ryzen 9 5900X with Msi B550 Gaming Plus MoBo. After using the PC like that for a couple hours, it crashed without a blue screen and immediatly after that tried restarting itself. The system posted correctly and is stable in bios, but as soon as it is trying to boot a drive(be it internal or an external windows install drive) it restarts with posting again.
Specs:
PSU: Corsair Rm 750x
MoBo: MSI B550 Gaming plus
CPU: Ryzen 9 5900X
GPU: GTX 1070
Storage: Boot-SSD 120GB, 1TB HDD, 2TB SSD

As sources for the issue, I already ruled out RAM, Harddrives and Software(even newly created Installation Drive wont boot successfully).
I am not really sure about my graphics card, but the way this issue presents itself makes me lean more toward a faulty psu/mobo or maybe even cpu.
That being said, I hope some of you guys can help me rule out the culprit. Any help is appreciated.
Here is a video of some boot looping.
 

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