So, I've been happily running my rig with 4×16 GB Corsair Dominator Platinum RGB 5200 sticks on BIOS version 1501.
I’ve just bought a Corsair Dominator Titanium RGB 2×48 GB 7000 kit, so in preparation for its arrival, I updated the BIOS to the latest version (1901).
After the update, the PC refuses to boot—it gets stuck at QCode 31, and after a couple of minutes, it eventually boots into BIOS with an F1 prompt to modify settings.
I've reset BIOS to defaults multiple times, to no avail.
I then tested booting with a single stick in slot A2, and the PC booted perfectly. I tested all four of my original sticks individually in that slot—no issues. Then I tested dual-channel in A2 and B2, and again, every combination of the four sticks worked just fine.
However, as soon as I populate all four slots, the problem returns.
Specs:
