Weird Breathing Sound But Won T Restart On Battery Drain For Calibrate Macbook Pro 15 Retina Display Mid 2012
Chosen Solution Hi, I bought a battery replacement from Ifixit for mid 2012 MacBook Pro retina.. All was going well until I followed the battery calibration process and let the power drain out until the machine shut down. After I plugged the power cord back in, the machine makes a kind of quiet rhythmic breathing noise but will not restart. The breathing noise sounds sort of like a fan starting to whir at startup but after a Half second then it slows and attempts to start again....