I remember back when Macbooks had issues with their temperature sensor. They would die due to the sensor cable being too short and everything expanding when the laptop got hot. Apple later resolved this with a firmware update.
Anyway, I got asked if I could fix a Macbook that was turning itself off. Sure, that's probably just performing the firmware update. But when I got the Macbook, it turned off just moments after starting OSX.
I put it in the freezer for 20 minutes and tried booting it again, yup, this time it took longer before it would turn itself off. I put it back in the freezer for a few hours. Booted it, started the firmware update, praying that it wouldn't turn itself off. Everything went successful and after that the laptop worked perfectly!
Anyway, I got asked if I could fix a Macbook that was turning itself off. Sure, that's probably just performing the firmware update. But when I got the Macbook, it turned off just moments after starting OSX.
I put it in the freezer for 20 minutes and tried booting it again, yup, this time it took longer before it would turn itself off. I put it back in the freezer for a few hours. Booted it, started the firmware update, praying that it wouldn't turn itself off. Everything went successful and after that the laptop worked perfectly!