Hi all, I'm facing pretty much the same issue as you guys!!!
I just replaced the magsafe board (DC in board) and now my Macbook doesn't want to switch on anymore.
Before that, everything was working well, I decided to put a new magsafe board because I didnt want to hanging around with 2 batteries (I charges those batteries from an external battery charger)
Could you help me to fix this issue please?
Laurent