Q: Sleep mode and the Fan

Hello everyone

My Macbook Pro started making loud fan noises about 5-10 minutes after activating Sleep Mode. This started some time last week and naturally, I began to get worried that it was a sign it would crash or something. But the thing is, once I out the laptop out of Sleep mode, the fan noises stop and my laptop operates normally. In fact, it remains cool throughout Sleeping, so it doesn't overheat or anything like that. I also discovered that the noise doesn't occur sometimes, and it Sleeps normally but most of the time the noise comes.

What do you think is causing this and how could I stop it? I have tried resetting the SMC but the problem still continued.

Thank you very much

MacBook Pro (13-inch Mid 2012), OS X Yosemite (10.10.5)

Posted on Aug 21, 2015 1:20 AM

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Q: Sleep mode and the Fan

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by OGELTHORPE,Helpful

OGELTHORPE Aug 21, 2015 3:46 AM in response to jaexe
Level 9 (52,323 points)

Mac OS X

Aug 21, 2015 3:46 AM in response to jaexe

Run an Apple Hardware Test. It may provide a clue:

https://support.apple.com/en-us/HT201257

Note that an error free AHT is not definitive.

Ciao.
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by jaexe,

jaexe Aug 25, 2015 1:01 AM in response to OGELTHORPE
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Aug 25, 2015 1:01 AM in response to OGELTHORPE

Thanks for the reply!!

I tried this, doing both the normal and extended tests and both told me that there was nothing wrong. The sound still continues to make noises after sleep mode!
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by OGELTHORPE,

OGELTHORPE Aug 25, 2015 2:52 AM in response to jaexe
Level 9 (52,323 points)

Mac OS X

Aug 25, 2015 2:52 AM in response to jaexe

You having tried the SMC reset and the abnormal symptom still exists, I suggest an appointment at an Apple store genius bar. The evaluation will be FREE.

Ciao.
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by jaexe,

jaexe Aug 26, 2015 9:52 AM in response to OGELTHORPE
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Aug 26, 2015 9:52 AM in response to OGELTHORPE

Oh okay thank you very much.
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by jaexe,

jaexe Aug 26, 2015 9:54 AM in response to jaexe
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Aug 26, 2015 9:54 AM in response to jaexe

UPDATE: I just checked the laptop right now after leaving it on sleep for about 3 hours and still hearing the sounds. The laptop felt warm and the battery drained by like 20% as if the laptop was still on. The macbook still runs normally though. Can anybody at all help me out here?
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by OGELTHORPE,Helpful

OGELTHORPE Aug 26, 2015 10:08 AM in response to jaexe
Level 9 (52,323 points)

Mac OS X

Aug 26, 2015 10:08 AM in response to jaexe

I sense that what you are describing is that the MBP simply is not going to sleep. See if there is anything in these Apple support articles that may be helpful:

https://support.apple.com/en-us/HT204760

https://support.apple.com/kb/PH18596?locale=en_US&viewlocale=en_US

Ciao.
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by jaexe,

jaexe Aug 26, 2015 10:32 AM in response to OGELTHORPE
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Aug 26, 2015 10:32 AM in response to OGELTHORPE

okay thanks I'll check on that now
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by jaexe,

jaexe Aug 26, 2015 11:14 AM in response to OGELTHORPE
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Aug 26, 2015 11:14 AM in response to OGELTHORPE

None of them really described the problem I was looking for and it doesn't seem to work.

Thanks anyway (:
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Q: Sleep mode and the Fan

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by OGELTHORPE,★Helpful

by jaexe,

by OGELTHORPE,

by jaexe,

by jaexe,

by OGELTHORPE,★Helpful

by jaexe,

by jaexe,

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by OGELTHORPE,Helpful

by OGELTHORPE,Helpful