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Model A1419 / Late 2012 / 2.9 & 3.2 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac13,2

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Fans on full when switched off

Hi,

I recently got a 21 inch iMac late 2012 second hand (from work). The iMac had Catalina installed and a 1TB fusion drive.

I was playing around with it for a week and everything was working fine, no issues at all of any kind, except sometimes it was a little slow when it hit the disk.

I decided to try and give it a boost by installing a SSD, so i removed the LCD panel, installed the SSD, put the panel back, formatted disk, put Catalina back and so far so good. Boots up, everything works and its a faster.

Except when i shut the iMac down, by selecting shutdown from the menu, the device shuts down normally but the second its off, the fans come on full blast.

Ive checked and it really is off, not in the process of shutting down with a stuck process or something, it is actually off.

If i switch it back on, the fans stop and everything is normal again. Shut it off and they come back on.

Only way to get it to stop is to physically unplug it.

Before installing the disk, everything was ok, so obviously i did something during the disk installation.

I thought the temp sensor wasnt a thing anymore, searching found me a lot of old posts from when it was new and basically said take it to Apple. Not an option anymore and it worked fine before.

Has anyone tried this recently and had a similar experience? If so, how diid you fix it?

Thanks!

Ответ на этот вопрос У меня та же проблема

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Did you pull out both drives? The SATA HDD and on the back side of the logic board the Blade SSD iMac Intel 27" EMC 2546 Blade SSD Replacement

A Fusion Drive marries the two physical drives into a single logical drive.

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Hi,

No just the HDD, then I split them into two separate drives in disk utility.

Regards,

Andrew

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@andrewproudlove - I find the caching SSD part of a Fusion Drive gets in the way as it tends to be well worn too.


Lets see wha the onboard diagnostics tells us. Restart your system and press the D key to enter. Did you get any errors?

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