Answer to "Mac not turning on... (Again!)"I have the exact same problem. 2 battery replacements. Completely intermittent. I can’t even discern the pattern (close it, open it, etc. etc.). Seems to be a common problem. I was told by tech ‘probably the logicboard’ but that’s an expensive repair. I didn’t have this problem until I replaced the battery. It sometimes seems to fix it when I unscrew back and replace. Or take out battery and replace. Any new answers anyone? Did cleaning the logic board work? replacing it? Thanks very much. Driving me nuts.