I have a MacBook Pro 15” Unibody early 2011. After leaving the device unused and uncharged for 2-3 weeks it booted okay, but failed to detect the magsafe.. the light was off and it failed to charge. So, I found a technique online that has worked on a number of occasions… I don’t know if it’s a good practice, but it does work… at least for me. (1) Disconnect Magsafe (2) Open case and disconnet battery with a spudger or carefully with a fingernail. (3) With laptop facing bottom-up with the cover off, reconnect the Magsafe. (4) Wait patiently, and the computer will (hopefully) boot itself without the need to press any buttons, it can take a minute or two, so be patient. (5) Just after the unit begins to reboot itself, quickly smack in the battery connetor and seat it firmly. (6) Hopefully your magsafe light will come on, pehaps first green for a moment, but then changing to orange. This method is only known by some people, but not too many. The point is, that after applying magsafe power, the unit will...