My current setup is AMD Ryzen 7 3700x, Corsair 750w psu, eVGA 2070 Super Hybrid, the monitors are new, both were working perfectly fine a week ago, identical Asus VG278QR.
Anytime I turn on my second monitor my fans on my AIO cooler ramp up to max speed and my machine completely locks up, both screens turn white. I've taken the rads out, dusted them with my Datavac, seems everything is getting adequate cooling, idle temp is 45c on cpu and 31c on gpu.
DDU - uninstalled/reinstalled fresh nVidia drivers, still happening.