Well I give up.
So tried to install Windows on the bottom M2 slot using the wd 850 then 750 and also tried 2 different USB drives.
It seems to crash around the time I input pin/corona/one drive/starts install... Seems random but always around that period.
One thing I noticed is my bios says pump speed 0, from what I can tell its connected right and currently in the bios it reads 42c core cpu.
I have no idea what the issue is... As mentioned previously when hooking up my dp monitor I got really wierd things happening like keyboards connected and then causing problems getting to the bios etc...
Does this make sense? Why issues installing windows? Would a bad mb cause this? Wouldn't think it would be the memory? Nvmes are acting the same and on their site it lists the 750 as compatible...
Oh and the gpu is fine, had to pop it back in my old system to do some work using my 4k dp connected monitor, and was fine. I need to get another gpu.