MacBook Pro 9,2 — chimes then shuts down, won't boot
I've a Macbook Pro 9,2 A1278 Unibody mid 2012 that won't boot. When the power key is pressed, it chimes than almost immediately shuts down. It also doesn't wake when the lid is raised. Will chime when the powerblock is removed — with the lid down. Acts the same on either battery or block power.
I've tried to reset the nvram, boot to diagnostic mode, soft boot, boot from cd. It doesn't stay on long enough for any of those things to work. I've replaced the RAM with some other RAM to no effect.
Update: Took it to an Apple store. They said it was the logic board. What doesn't make sense to me is that it chimes when the lid is closed, the power block is on and then removed. And Id've thought it wouldn't start at all if the logic board is involved.
I undid all the connections to the logic board and it starts up with a chime and blue screen, then immediately shuts off. The screws for the RAM retainer were tight.
Is this a good question?