So I have a MSI Z-390 A Pro Motherboard with i5-9400f, Asus RTX 3070 and 2 x G-Skill RipJaws 2133Mhz RAMs. The issue is, out of the 4 slots (B1, A1, B2, A2), A1 has completely stopped working. And now when I have only 1 RAM installed in slot A2, as I boot up my PC, after signing in to Windows the screen flashes 1-2 times and after a random amount of time my PC just shuts down. I switched to slot B2 (i know its not optimized) and my PC has been running just fine. What should I do about the faulty slots ?