I've just put together a fresh build using an X870e Aorus Pro motherboard and 64GB of Crucial RAM. The problem is, it refuses to boot when both RAM sticks are installed—only one stick works at a time, regardless of the configuration I try (A/B or 1/2). I'm at my wit's end here!
2 Answers
Make sure your motherboard's BIOS is updated. Sometimes older BIOS versions can have compatibility problems with specific RAM configurations.
Have you checked the RAM speed and timings? Sometimes mismatched settings can cause issues. If your RAM is supposed to run at 5600MHz but shows 5200MHz with one stick, that might be something to look into.

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