High fan noise when in Login screen after restarting, on my MacBook.

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mischa43 Author

Level 1

10 points

High fan noise when in Login screen after restarting, on my MacBook.

After some recent updates this has started occurring.

Restart computer. Something is using resources, so that heat builds up and fans build to max. Eventually the computer shuts down for self protection, presumably. FileVault ON.

Try again with FileVault OFF, after decrypting the drive. No building fan, computer stays in sleep.

Try again with FileVault ON, same as bullet 1.

MacBook Pro (Retina, 15-inch, Mid 2015) - Monterey 12.7.4 (21H1123)

The workaround is to either disable FileVault; or login immediately after a restart.

Apple please fix this. This is a more recent annoyance.

[Re-Titled By Moderator]

MacBook Pro 15″, macOS 12.7

Posted on Mar 14, 2024 6:09 PM

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Answer 1

mischa43 Author

Level 1

10 points

Mar 16, 2024 7:00 PM in response to mischa43

Thankyou for the replies from the support community! @BobHarris @ Old Toad

I've done:

Safe Mode

Reset NVRAM

Reset SMC

Apple Recovery Diagnostics

No change.

Remember the problem occurs after a restart and during the login screen ONLY; the drive is still encyrpted. As far as I'm aware login items only start after login & decryption. So it can't be one of those. The building fan problem goes away after login & decryption, all the login items load. Security suite, VPN, etc. 2 minutes later the fan is idle; which is normal behaviour.

It's an old machine that has never been opened, there's probably some dust inside. I doubt that would have much of an effect on the problem. I've read in other fora that somebody took a Macbook in to the Apple Bar for the same problem. The tech said he suspected that a runaway FileVault process was to blame. His solution was to downgrade to Sierra (reinstall), then upgrade to High Sierra. Problem Solved.

I just hope that Apple can do something in an update, because I can't be bothered with a clean install!!

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