Aporte original por: Mjer ,
MacBook Pro 2012 start up problems
I was using my Mac with a extended screen when I closed the screen and laptop went to sleep and woke up the next day and tried to use it and it wouldn’t turn on. It makes the chime noise but then shuts down again. If I do manage to have it start it goes into a login screen with a safe mode type of a login but I still can’t login. I tried erasing the hard drive by going into system recovery. It didn’t let me do it. The way I accessed system recovery was through the menu bar on the top left. I replaced the battery because someone recommended that maybe it’s a power supply issue. But no help.
MacBook Pro 15" Unibody Mid 2012