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Ursprünglicher Beitrag von: Ronnoc Nailli ,


won't power on with button, CAN reset SMC with button, can power down


this particular MacBook has me scratching my head.

as mentioned, it's mid2012 A1278 base spec, and the machine will NOT power on from the power button.  if i yank the battery and connect the magsafe, it fires right up.

when powered off i can reset SMC with the power button, or at least the magsafe indicates that i can.  i've attempted multiple SMC and NVRAM resets.

once the machine is powered on, i can initiate sleep or shutdown using the power button.

I have pulled this MLB and put in another functioning mac, with the same result so I'm confident it's the one MLB and not two keyboards.

anybody have any experience with this?


MacBook Pro 13" Unibody Mid 2012