Rispondi a "Mac not turning on... (Again!)"today i faced with this problem and the are two scenerios i have experienced; 1 when i unplugged battery cable, leave it like that, then plugged the magsafe adapter -> power button worked every time. (being able to use a mac only with cable. no thanks) 2 when i unplugged battery cable then plugged then plugged the magsafe adapter -> power button worked only one time. after i shutdown the mac didnt workout again. this means keyboard and battery works. but there is a problem. its so we weird that many people faced with that and still no decent solution :/ ps. : when i reboot everything is fine. this happens only i shut down the mac from os or power button.