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Late 2011 model, A1278 / 2.4 GHz i5 or 2.8 GHz i7 processor.

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MacBook very slow and power button pressed for 5 seconds to turn on

Hello everybody,

This is my first post on iFixit. Most of the problems that I had with my devices were solved with answers founded in this forum. So thank you very much!

But the current problem I was unable to solve it. Despite the weeks of searching on the internet I couldn’t find an exact solution for my problem or due to lack of information. So I decide to try writing it here. So here it goes:

My macbook is a pro 13” late 2011 with RAM changed from 4 GB to 8 GB (4GB each) and 500 GB HD to 500 GB SSD.

The macbook only starts when a I press the power button for more than 5 seconds. When pushing the button quickly the fans turn on and I can hear the beginning of the boot and then it turns off.

After a long time on the loading screen, the macbook works but extremely slow. The kernel activity on task manager is on 400%!

I’ve already tried:

-Removing battery

-Reseting NVRAM

-Reseting SMC

-Reinstalling OS

And nothing of the above worked. The closest of getting it fixed was formating the SSD through other mac and installing the OS original from factory. But, the app store didn’t let me upgrade to the latest version that was allowed to my model and kept sending me an error message.

Shortly after, the first problems of slowlyness and 5sec button pressed returned.

That last thing I did was a Apple Hardware Test that found the following error:

4SNS/1/40000000: IB0R-9.166

I think it is related to a battery problem. After some searching about this error I’ve found many forums saying that it’s a problem with some corroded capacitors (which I was unable to identify because I don’t have the schematics of the board).

My questions are:

1- Where I can get the schematics for the motherboard?

2- If it is the battery, what tests should I do in order to check the health of it?

3- Any suggestions of what should I do next?

Thanks in advance.

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Looking on your logic board you should see the board number: 820-xxxx with that in hand you can then search for it in google 'Apple 820-xxxx that will get you the available schematics and boardview drawings.

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Hi,

I have exactly the same problem on my macbook 2011 I5 13’, I have to press the power button for about 5 seconds for it to start and it is extremely slow. When I start in safe mode, it works normally.

Lucas, did you solve the problem? What have you done?

Thank you!

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Sadly, this series has known issues with the dedicated GPU logic which I suspect is your problem here. The only thing you can do is disable it using this app gfxCardStatus

Disconnect the battery with nothing connected press the power button to reset SMC this way for a good 15 sec’s. Reconnect the battery and the MagSage restart in Safe mode pressing the Shift (⇧) key when you restart the system. Then install the App and set it for integrated graphics alone.

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Reference: Mac startup key combinations

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Hi Dan, sorry for the late response! I've installed gfx and choosen the Integrated Only option and it still very slow with kernel_task varying from 242% to 1150%!. Other problem that I've noticed is that when I try to access iCloud configurations through System Preferences it says: "Preferences Error - Could not load iCloud preference pane".

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@blacklight19 - Sorry for the late replay, your post got lost!

At this point from the added info I thin you need to visit someone local who has Mac repair skills.

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Lucas Vivian zal eeuwig dankbaar zijn.
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