My son was on my 2012 MBP 13 and let the battery drain too low and the computer went into hibernate mode. It's never been a problemplugging in the magsafe and hitting the power button brings things back up after a bit. Today it was different. Plugged in the magsafe, hit the power button, and there was no response. The LED on the magsafe was glowing orange, like it should have been, the battery indicator LED's were working, and after a while the battery was charged. That was all thoughpower button, hard restart with the power button, SMC reset, all yielded the same results. It acted as if there was no battery at all, completely dead. I was able to circumvent this by opening the cover and disconnecting the battery harness, and then plugging in the magsafe chordas soon as I did this the machine fired right up. When that happened I was able to connect the battery harness and close the computer back up. It's running now, charging normally, and I'm able to unplug the magsafe and it holds it's charge, but shutting it down and restarting forces me to go through the whole battery disconnect thing again. I'm new to the forumsI've looked around for something similar to post this in, but haven't found one, so I apologize if this is redundant. I'd appreciate any help though, thanks!