I just built a PC with the following:
MSI B450 Tomahawk Max
Ryzen 7 3800x
NVIDIA GeForce RTX 2070 Super
G.Skill Ripjaws 4x 8GB DDR4
I've tried two different CPUs in this (Ryzen 7 3700x and 3800x), took everything apart and put it back together three times, tried starting with...