Hi guys, if you want to save your money and literally do it for free then follow my solution, my wireless keyboard wasn’t working so generally i thought it was out of charge, and so the next day when i put working battery it didn’t seem to turn on, so I realized that might have broke or something, I came to this website and read about the tin foil trick, and yes I had tin foil, but wasn’t really in the mood to getting up and using tin foil, so I put the two batteries in properly, and then when the battery area got filled I pressed with a medium force down on the batteries so some force would go to the the third battery which is allows in the Mac, boom it started working. You’ve got to try it, and guess what that’s all free.