I have a new system with a Ryzen 5 3400G CPU, ROG Strix x370-F Gaming MB and have tried with Kingston KVR2N17D8/16 (2-sticks for 32GB ram) and in the process ran through all the combinations of one or two sticks, but the yellow DRAM on the MB stays on (have tried for up to 10 minutes). Similar results with Corsair Vengeance LPX 3200MHz memory.
I have read that there can be BIOS incompatibilities that interfere with DRAM recognition. This MB does not have the flashback button/capability. And have read that the Ryzen on 1st boot can be extremely slow, but exceeding 10 minutes seems excessive...
Suggestions Gratefully Accepted.
FWIW, I have a similar question on the ROG support forum since this issue seems to be related to the CPU MB combination.