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Model A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac12,2

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Error 4MOT/4/ 40000002: HDD-0

Hi everyone,

I changed the HDD of my iMac 27 "in mid 2011.

After some research I saw that the OWC in-line digital thermal sensor hdd upgrade cable was also needed.

I replaced / added the 2 components and turning on the iMac it reaches the login screen and then restarts.

Using the Apple Hardware Test I discovered this error: 4MOT / 4/40000002: HDD-0.

What is the reason for this error if the HDD and sensor are new ???

I also tried to set the fan speed behind the HDD but it remains constantly at 0.

Do I have to replace the fan ???

Thanks a lot to everyone!

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Your HDD fan has failed!

完成的

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Ouch! You’ll need to open the system again and this time you’ll need to pull the HDD out and logic board 1/2 out to gain access the HD fan just behind it iMac Intel 27" (Late 2009-Mid 2011) Hard Drive Fan as iFixit is out of stock you’ll need to look elsewhere 27” iMac 27 Fan - Hard Drive, Apple P/N 922-9872 (used)

iMac Intel 27" (Late 2009-Mid 2011) Hard Drive Fan图片

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iMac Intel 27" (Late 2009-Mid 2011) Hard Drive Fan

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Hi everyone,

I replaced the fan as @Dan suggested but the error remains.

At this point the problem could not be the power supply or the logic board ???

Thanks a lot to everyone!

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Luca Rimediotti 将永远感激不已
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