Macbook not booting but fan rotating at full speed - Solution

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Macbook not booting but fan rotating at full speed - Solution

MacBook Pro Retina 13"display Late 2014(A1502) .

So my Mac was working all fine but all at a sudden it didn't boot up but only fan starts revolving at full speed making lot of noise.

Tried SMS reset, NVRAM reset, unplugged battery and fan cable. None of this solution worked.

What worked was keeping it in sunlight for half an hour.

Keep you Mac in sunlight in so that it becomes warm, the moisture present on logic board will go away.

The back of the laptop should be facing the sun, not the display.

Try to boot now it will boot up.

If no sunlight, then warm it a feet above hot plate, don't burn it up. Only the back cover part, not the display side. Don't keep it at one place, keep moving your hand so that heat is distributed evenly. Just warm, don't use very high temp

This is no joke, tried and tested. It will continue to work when the Mac is warm, you'll again face the problem after sometime.

Will let you know if its logic board issue or temporary humidity issue.

Most probably its logic board issue

Posted on Sep 15, 2020 9:04 AM

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Answer 1

Sep 15, 2020 9:41 AM in response to rohit3120

Have you run the diagnostic? (hold D-for-diagnostic at startup, and you may have to wait for it to load over the Internet).

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Answer 2

rohit3120 Author

Level 1

8 points

Sep 15, 2020 9:30 AM in response to Grant Bennet-Alder

i'm in Singapore right now and the mac was and is at normal room temperature when this happened. It's raining a lot here so probably some humidity issue maybe.

No repair shop was actually able to tell me what could be the reason.

I plan to get it repaired back in india where it's reasonable to get logic board repaired than here in Singapore plus trusted shop i know there.

Today i have erased full SDD and reinstalled mac and now observing the issue. Also reset NVRAM.

What do you think the issue would be ?

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Answer 3

Sep 15, 2020 9:43 AM in response to rohit3120

rohit3120 wrote:

If no sunlight, then warm it a feet above hot plate, don't burn it up. Only the back cover part, not the display side. Don't keep it at one place, keep moving your hand so that heat is distributed evenly. Just warm, don't use very high temp

This is no joke, tried and tested.

Do you have to do this on a Tuesday, standing on one foot and moving your hand over the bottom cover of the Mac in a widdershins direction?

Sorry, but anyone reading this please do not put your Mac on a hot plate, on a stove, in a freezer, or remove the back cover and set your Mac in the sun as the OP suggested in an earlier (now deleted) post.

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Answer 4

Sep 15, 2020 9:19 AM in response to rohit3120

if conditions were conducive to condensation on the cold aluminum chassis, then your Mac was being operated in an environment beyond its stated requirements of 5 percent to 95 percent relative humidity, non-condensing.

Letting it sit for a while so that it adapts to ambient temperature and humidity is the best way to fix that problem. Gentle warming by placing in sunshine will also work to eliminate internal condensation conditions, but the main "fix" is just allowing its temperature and the humidity to stabilize.

Never, ever, EVER apply heat from ANY external source such as a hotplate to your delicate electronic devices. That could kill it.

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Answer 5

rohit3120 Author

Level 1

8 points

Sep 15, 2020 5:07 PM in response to neuroanatomist

Not just tuesday, but everday from last 10 days. One feet and the plate settings to 2 or 3 and just moving the mac back and forward without making it hot but just a bit warm. And after 10 mins, it boots :)

I do understand this is very weird to keep it in sunlight etc but from last 10 days i'm doing the same, and everytime its working. Once I see the login screen, its all okay then. I try not to shut down it. Moreover, even if I hear the chime sound and the apple logo comes, it power off sometimes. I tried all solutions posted on different forums but none worked.

Someone suggested to remove fan cable and switch it ON for 30 mins, plug back and it will work. There were many positive response also for this solution but it didn't work in my case.

All set once login screen appears, I play some random game for 50-10 mins and then start my work.

For the time being, I bought a second HP laptop for my daily work.

It's like our TV remote battery, when they don't work. We remove them and rub and put it back. They work for sometime.

Few repair shops asking atleast 250 SGD to repair it and at max 400 SGD.

As far as I can think, there's some issue with the power IC, sort of boot sequence.

[Edited by Moderator]

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Answer 6

rohit3120 Author

Level 1

8 points

Sep 21, 2020 8:01 AM in response to Grant Bennet-Alder

Till today, I'm still using the same technique and 100% it boot up else it doesn't.

Though from last 4 days i have not shut it down and keeping it ON 24 hours,

Sometimes i put it on Sleep mode just for testing purpose but it has not shown the same problem in sleep mode.

I just hope this issue goes away by it's own

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Answer 7

rohit3120 Author

Level 1

8 points

Sep 15, 2020 4:20 PM in response to Grant Bennet-Alder

Yeah, it says no issues found.

When it runs it runs all fine. After booting up no issue at all.

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Macbook not booting but fan rotating at full speed - Solution

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