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MacBook restarts instead of shutting down

Hello All,

My MacBook more often than not will restart when I try to shutdown.

If it does shutdown successfully when I close the lid it starts up immediately.

With the magsafe connected and the MacBook shutdown removing the magsafe will also cause the MacBook to start up.

Usually the only way to stop it restarting repeatedly and keep the MacBook off is to hold the power button down, which does keep it turned off.

This MacBook is the A1342 Late 2009 model and came to me as water damaged. I replaced the Top Case as it was faulty and I thought I managed to thoroughly clean the logic board of any residue.

I have repeatedly run the hardware tests and they have all PASSED.

I have clean installed Yosemite and I have upgraded to 8GB Ram however I still had these problems with the old 2GB Ram and also with Lion and Mavericks.

I have reset the SMC and PRAM multiple times.

I am at a loss as to what the problem could be, I have had a thought it could be linked to the MacBook running very hot however it also happens when it has only been on for a couple of minutes.

I have read other similar questions and one in particular stands out, that being a potential problem with the Airport card however this one seems to have passed the hardware tests and is present in the Network menu.

I would be grateful if anyone has any thoughts on how to resolve this problem or at least point me in the right direction and show me anything I am missing.

Many thanks,

Nabs.

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You talked about replacing the upper case. Did you remove and clean the logic board? It sounds like you still have some spillage still on it.

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Thanks for your reply.

Yes I removed the logic board and cleaned it with isopropanol. Maybe I missed some but I am sure I was pretty thorough. I disconnected the upper case earlier to see if it would still restart when the lid was closed and it did not. Could the replacement upper case also be faulty or a problem within the zip connector? Do you know if the problems I'm having could be accounted for if any of the pins in the connector were shorted ?

Thanks again.

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Good test! If the upper case ribbon cable disconnected solved the problem then I would suspect the upper case has a problem. Can you try a second one?

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Unfortunately I don't have a second one to try, only this one and the original which is liquid damaged. I do have a MacBook Pro A1278 which I might be able to use for testing purposes depending on dimensions. I was hoping it would be something simple like the seating of the ribbon cable or debris in the connector. Do you know what could be happening in the uppercase to cause the restart when the lid is closed? If I shutdown and it does not initiate a restart when I close the lid immediately it more than likely will restart, however if I leave the lid open for say 10 minutes when I shut the lid it does not start up. Could there be a grounding problem, is there a charge still present at shutdown that could cause a restart? Could this also explain why when removing the magsafe after shutdown it will also restart? Thanks for your time!

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You do need to use the correct upper case here. Don't try the MacBook Pro uppercase it could damage things. Simply put, the case has the switch logic for the power button which is likely defective here.

by

Okay thank you for your help. Looks like I have two options, change the case again or live with it.

Thanks again!

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