Your keyboard power-ribbon cable is most likely not inserted properly, if at all. I’d bet it is not inserted and locked down all the way. If you’re not sure what I mean, it is the small, 1/4 inch wide ribbon cable alongside the main keyboard ribbon cable and MUST be in place FULLY, straight and locked down with the locking flap on the motherboard connector. Need any more info/instructions, have fixit message me and I’ll do my best to help.