Pc keeps crashing after upgrading from 1080 to 1440 monitor

[theben11]

CPU: AMD Ryzen 5 5600X 3.7 GHz 6-Core Processor
Motherboard: Asus TUF GAMING B550-PLUS WIFI II ATX AM4 Motherboard
Memory: Corsair Vengeance RGB Pro 32 GB (2 x 16 GB) DDR4-3600 CL18 Memory
Video Card: Asus TUF GAMING OC GeForce RTX 3070 8 GB Video Card
Power Supply: Corsair AX860i 860 W 80+ Platinum Certified Fully Modular ATX Power Supply
Operating System: Microsoft Windows 10 Home OEM - DVD 64-bit

Describe your problem. List any error messages and symptoms. Be descriptive.

I had a 1080p monitor with 60hz and upgraded it to a 1440p AOC 165hz monitor. Now my system keeps crashing when playing games (rarely when doing other stuff). I get the Kernel 41 fault in the crash protocols. No dump file created.

I cant clean install windows as it always crashes during the process.
Sometimes the PC cant be started and it immediately tunrs off again after 0.1 second. (CMOS reset fixes that)

NOTE: I bought the 3070 second hand from a crypto miner.

List anything you’ve done in attempt to diagnose or fix the problem.

*I un- and reinstalled all drivers that have something to do with graphics.
*I updated bios *I set my GPU to a lower power consumption (80%)
*Did a windows memory check (it repaired something but the fault persists)
*I ran it with 1080p on the new monitor
*I tested CPU on another rig without problem and even installed my 5900 with only the stock fan into the faulty build (so temp cant be the issue as sometimes it doesnt start in the morning)
*tried a clean install of windows (unsucsessful)

Provide any additional details you wish below.

Can anyone tell me what other things I can try? I now assume its the motherboard causing issue but I reset it and updated bios and everything

[Bastet]

When you uninstalled the graphics driver did you use DDU to cleanly remove it?
If not then I would recommend doing so.

https://www.wagnardsoft.com/forums/viewtopic.php?t=4699

[theben11]

When you uninstalled the graphics driver did you use DDU to cleanly remove it?
If not then I would recommend doing so.

https://www.wagnardsoft.com/forums/viewtopic.php?t=4699

I did use DDU

[veeg]

I would go back and check that memory fault .

[theben11]

could this cause the no boot problem?

[veeg]

Probably, go in and check your memory sticks one at a time , to see if a stick is bad or the memory slot.

[Bastet]

I did use DDU

Thanks. Just to check that you uninstalled the driver within safe mode as recommended? If yes then check the memory sticks as veeg mentioned.