Macbook Pro mid 2012 won't go to sleep

Question

Macbook Pro mid 2012 won't go to sleep

Thought this started when we downloaded Mojave a few weeks back. When we shut the lid the computer will not go to sleep or does goes to sleep and then light goes on off..computer hot in the AM.

Brought computer to Apple Genius bar they found nothing wrong.

Had then do clean wipe and install High Sierra but issue still exists.

Have to remember to shut computer down which is hard to do after many years (and several macbooks) of just closing the lid. Back to genius bar and they found no software or hardware issues...but somehting must have happened. Any thoughts or others with same issue?

MacBook Pro, 2.9GHz Intel Core i78Gb

Posted on Nov 28, 2018 4:37 PM

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Answer 1

Dec 14, 2018 9:53 AM in response to Howard Kalachman

Same problem. (Mid-2012 15" MBP). I installed 10.14.2 on Samsung 860 SSD and installed the SSD inside, replacing Sierra HD. Magnetic switch no longer works. Reinstalled Sierra HD and now Sierra re-boot doesn't fix the problem. Yes, I reset P-Ram and SMC... no dice. Did the Mojave installation trash the sensor switch?

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Answer 2

Dec 14, 2018 11:22 AM in response to Philip Shima

And when I tried to find out if the hd/IR cable was defective by booting into Diagnostics (hold down D key or Option-D restart), I got Error Code: DEC400.

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Answer 3

Allan Jones

Level 9

77,948 points

Dec 14, 2018 10:08 AM in response to Howard Kalachman

Brought computer to Apple Genius bar they found nothing wrong.

Did they advise you to try an SMC reset?

How to reset the System Management Controller (SMC) on your Mac - Apple Support

From that article:

The SMC is responsible for these and other low-level functions on Intel-based Mac computers:

Responding to presses of the power button

Responding to the display lid opening and closing on Mac notebooks

Battery management

Thermal management

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Macbook Pro mid 2012 won't go to sleep

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