Not sure this will help. But I encounter that with R2E.
1. Clear CMOS
2. Unplug all cable.
3. Remove all your RAM. PCIe....
4. Remove your cmos battery and wait for 5-10 mins and insert back the battery.
5. Put back everything and boot it up.
Hope it help. At least my last R2E having the same issue as you.
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