MacBook will only run on AC after replacing a swollen battery, why?
My battery was swollen so i removed it and bought a used one (reportedly in good working order). But my computer won't acknowledge the battery. I can boot it up without the battery (press power button ten seconds, then while still pressing connect magsafe adapter, then release and press once) It runs fine on AC, but with a really loud fan. Not sure what's going on. Did the previous severely swollen battery damage a connection? I'd love any tips on how i might fix this. thanks.