Well since your RAM tests fine I'd disconnect everything that wasn't important and then upplug AC cord, unplug battery for 30+ seconds. Then try updating your BIOS.
Also, after reflash, set your BIOS to load defaults then save. Reboot. Let it sit at the "no bootable drive" message. Power off via PSU and yank AC and battery again. Load defaults then set it up the way you need it to be.
I'm just trying to rule out that there is something going wonky with the EFI
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