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will not power on unless battery and Magsafe are removed and reinstall

Hi I have a MacBook Air Mid 2011 the only way I can get it to start is if I unplug the Magsafe adapter and then disconnect the battery. which is a pain as you have to remove the base.

I then reconnect the adapter and the Air will start. I can also reconnect the battery and that charges ok. I also can remove the Magsafe once running and the Air runs on battery fine. It will also restart on both battery and Magsafe ok, it only wont start if I shut down.

I have installed a new IO power input board all ready with the same result.

I have tried the shift+con+opt+power does not work

I have tried nvram as well.

Have tried resetting SMC as well

I have also run all diagnostic test which reports no problem.

I have updated, reinstall OS done a clean factory install still no good.

Any help would be greatly appreciated



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Thank you for your quick response I will check it on the weekend and let you know how i went.


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1 Answer

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I suspect some missing history involving a liquid spill. Open the device and reexamine closely under a magnifying glass for corrosion or burned/swollen components (Possibly the SMC chip because basically your procedure is the long way around the barn for an SMC reset).

If you find corrosion cleaning (in 90% or better alcohol and abrading with a soft bristle brush) may solve your problems.

If you find burned or swollen components you'll have to replace them or the logic board.

If this answer is acceptable please remember to return and mark it.

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