Boot loop on the computer, what to do?

Question

Computers

Specifications:
Motherboard: GIGABYTE AM4 B550 AORUS ELITE V2 (bought today, did not solve the problem)
Power supply: Be Quiet SYSTEM POWER 9 700W
Processor: AMD Ryzen 5 3600
RAM: Kingston HyperX Fury 8192MBx2
Solid state drive: SSD M.2 2280 1Tb Samsung 970 EVO Plus
Video Card: Gigabyte GeForce RTX 2070 Super 8192MB

I can sit in the BIOS for as long as I like, but loading into the OS or from a USB flash drive leads to a reboot during startup. I can't access Windows Recovery. I tried to install different pieces of iron from another working computer: a video card, bp, even hdd - the problem was not solved, it was not possible to make a diagnosis. In any case, I planned to upgrade the motherboard, so at the same time I now know for sure that the problem is not in it, since nothing works with the new one either.

The only thing I could not check is the RAM and the processor, since there are no spare ddr4 dice and am4 processors. I doubt very much that the problem is in the RAM, because two simultaneously flying dice is too much luck (tried one at a time).

I tried to install Ubuntu, made a bootable USB flash drive according to the office. guide - restarts, but managed to catch a few errors before rebooting:

[0.535784] mce: [Hardware Error]: CPU 1: Machine Check: 0 Bank 0: fea0400000
[0.535784] mce: [Hardware Error]: TSC 0 ADDR 4162ba2ae MISC d01200a300000000 SYND e1c1b0a01 IPID b000000000
[0.535784] mce: [Hardware Error]: PROCESSOR 2:870f10 TIME 1623188973 SOCKET 0 APIC 2 microcode 8701021
[0.548075] mce: [Hardware Error]: CPU 7: Machine Check: 0 Bank 0: dc20400000 0c0135
[0.548078] mce: [Hardware Error]: TSC 0 ADDR 4193562ae MISC d0130fff00000000 SYND e1a1b0a01 IPID b000000000
[0.548081] mce: [Hardware Error]: PROCESSOR 2:870f10 TIME 1623188973 SOCKET 0 APIC 3 microcode 8701021
[2.906842] r8169 0000:04:00.0: unknown chip XID 641

Based on all of the above, I can assume that the problem is in the processor. However, I cannot be 100% sure and I would like some confirmation that a dead processor can affect the operation of a computer in this way. If you have any other ideas of what might have gone wrong, I'd love to hear it. Thanks to everyone who read to the end.

Additionally:
When installing exactly working components from another computer, the voltage that they produce was taken into account. I used the ASUS AMD Radeon RX470 video card for tests, I don’t know for sure the power supply, but it’s 600W, so I tested it together with the RX470, with which it works every day.