The A320 and 777 are fly-by-hydraulics, you know. Only the signalling is electric.
Yes I know that practically all actuators even with FBW are hydraulic, electric motors have characteristics which make them unsuitable for most control surfaces. The signalling is as you say electric but not "only". The BIG difference is that there is no need for hydraulic steering and computational elements like spoiler-mixers and ratio changers etc. Low level computers work out all that stuff - pooters like the FACs (and T7 ACEs) which are topic of conversation.
great article in link - BUT still unclear if pushing buttons either RESETS the FAC or totally kills it as in Circuit breaker
FA Computer. Think shut-down & reboot on the buttons. Unplugging it via the circuit breaker. If your computer is acting weird, reboot. if it has smoke coming from it pull the plug out.