Failing Hardware Diagnosis

Hello,

it started with videos sometimes having vertical stripes that would disappear after a few seconds or minutes.
Later my whole PC would crash while watching youtube.

Afterwards the whole PC was basically trashed. While booting there are three outcomes:

1- the PC boots correctly but will almost always crash soon afterwards. The graphic glitches are always all over the screen.
2. get redirected to the BIOS [all default settings there].
3. Im prompted to repair Windows or to restart.


My hardware:
OS Version: Microsoft Windows 10 Pro, 64 bit
Processor: AMD Ryzen 5 1600-Core Processor, AMD64 Family 23 Model 1
Stepping 1
Processour Count: 12
RAM: 16317 Mb
Graphics Card: NVIDIA Geforce GTX 560 Ti, 2048 Mb
Harddrives: C: 222GB (193 GB Free), D: 931 GB (167 GB Free);
Motherboard: ASUSTeK COMPUTER INC., PRIME B350M-A
Antivirus: Windows Defender, Enabled and Updated


Things I already did: Reinstall Windows -> No change, replaced my Power supply, tried a different harddrive

Pictures of what it looks like:

https://imgur.com/a/fxUHBAh