Pc Launching Issues

[Spork Man]

So I had just recently built a new pc with these specs:

asus prime x570 pro mobo

amd ryzen 7 3700 processor 

gigabyte geforce rtx 2070 super 

samsung 970 evo

seagate barracuda 2tb

corsair vengeance ddr4 -3200mhz 8x4

corsair rm 750+ watt 80+ gold

Windows 10 pro 64bit - installed on the m.2

 

So I built the pc about 2 weeks ago and everything was fine but few days ago started getting bsods and I kept getting them back to back so I just went into bios and reset it to default to see if that would help. Now I’m stuck and cant find anything that has helped me so far, with csm on it launches to the windows loading screen but just black screens. With csm off it doesnt show my drives as bootable even though it shows up in the bios screen. Windows is installed on the m.2 and has worked fine since now.

 

If anyone can help me that would be amazing, 

Much thanks!

[fuzz0r]

What are the stop codes of your BSOD's?

[Spork Man]

They started off as memory management and then lead to others like critical process died and a few others I can’t remember.

[fuzz0r]

Have you tried booting with 1 ram stick at a time?
Also a memory diagnostic tool would probably be good to run.

Memtest86 or windows' own.

[Spork Man]

Ok will do but current issue is cant get my m.2 to show up under bootable drives unless im in csm 

[Spork Man]

So got the pc to boot and run csgo and other games but im still stuck in csm idk if that could cause problems but it works. 
thanks fuzzor0rbfor the response