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Regarding using ECC RAM in a not-supported system, mostlikely it won't boot for that reason.
The ECC RAM would still try to perform it's ECC procedures but the system wont recognize them which would lead to issues while booting or interacting with the system(RAM/Computer).
Just make sure you are using a compatible set of RAM: DDR3L-1066 1.35V SO-DIMM
Please do provide us with an outcome when the RAM is changed to a compatible module.