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The April 2014 update of Apple's 13" MacBook Air features refreshed dual-core i5 and i7 processors, plus slightly increased battery performance.

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Fans full speed, mouse and keyboard stop responding. What part is bad?

The symptoms are when you startup, the fans run full throttle, the trackpad and keyboard work for a little while, you can login. But almost instantly the built-in mouse and keyboard stop responding, and a dialog comes up asking to pair a bluetooth keyboard.

If I connect an external keyboard and mouse they work, but the fans are still running full throttle on the laptop.

Thinking it must be a logic board issue, I purchased a replacement online and just finished installing it using the iFixit repair guide, and to my disappointment the laptop has the exact same symptoms.

And before you say it’s a software issue, if I boot using a macOS installer USB, the symptoms are very similar.

Do you think I should replace the trackpad component next, or what else could be causing these issues considering I’ve already replaced the logic board?

Answer this question I have this problem too

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1 Comment:

Did you have a liquid spill at some point?

I would restart the system and press the D key to enter into the onboard diagnostics, let us know what the errors are.

Reference: Mac startup key combinations

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Replace the keyboard

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3 Comments:

Why do you think that?? Throwing spaghetti the wall won't getting you very far.

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I experienced that before. But am open to learning if you have another idea

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@Alexis Jaymes - I had recommended to run the onboard diagnostics (in the comment above) to see if an error popped. Leveraging the tools we have access to to limit our focus on what it tells us. Sadly, I think Author was unwilling or unable to get that far and hopefully found his way to someone local to help him.

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Arthur Wiebe will be eternally grateful.
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