Weird breathing sound but won’t restart on battery drain for Calibrate
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. This cycle continues on and on. Finally after a couple hours i unplugged i. that is the only thing that stops the rhymic very low sound. The sound starts again if I push the power button to attempt a restart while unplugged. Besides the problem of the machine not working, I’m also concerned that the calibration failure will effect the battery. Thanks for your help.