Respuesta a "Replacement Keyboard Not working"If you re-connect the old keyboard is it the same as before?
Respuesta a "Old SSD card showed question mark, new one shows nothing"Sounds like faulty or incompatible SSD. What happens when you turn the MacBook on with no SSD installed?
Respuesta a "Bootloop after lightning flex cable replacement on an iPhone 8"Are all the replacement lightning docks you’ve tried from the same supplier? - ie. could they all be faulty? I try to keep genuine spares of most common replacement parts for each model for testing.