My daughter was using a MacBook Pro 13 mid 2012 unibody for college. Recently did a clean install on a 1 TB SSD of High Sierra. Was working fine until she came home for weekend. She says she closed lid with it running when packing. When she got home I was going to a time machine backup and it wouldn’t start. Tried everything you can read in this forum. I left battery disconnected and charger off overnight. Next morning reconnected battery and it started right up. I didn’t log in but shut it down from menu. Immediately tried to turn it on again and nothing! I’m thinking MagSafe board? Only other thing is old charger only worked intermittently so I purchased a new one direct from Apple store. She used the new charger and worked fine. This was only 1 day before she closed lid while running and got the no start. Could the new charger have something to do with it? I’ve changed MagSafe board before so may try that for 10 bills. Any other ideas please tell me. I’m getting peeved with this machine! Thanks