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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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AHT Error: 4M0T/4/40000003: HDD-1229 Is it easy to solve?

Hello, they want to sell me an iMac 27 EMC 2429 that has this error in AHT: 4M0T/4/40000003: HDD-1229 is it easy to solve?

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From what I have read that is a HDD fan motor error. Could be an easy fix with just cleaning out the dust. It’s also could be a bit more tricky than that.Personally I wouldn’t get it unless it was cheap just in case it does have more than what seems to be wrong at first glance.

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@thequacker If it were on the sensor, the code would be 4SNS, not 4MOT, correct?


@ramonferre18311 Yes, I am sorry. I must have misread. In that case it could be as simple as cleaning the dust out or replacing the fan.


@ramonferre18311 & @thequacker - The fan tach feedback is the failure. Either because the fan is jammed or the contacts sensor within it has failed. Which is why this is a 4MOT error.


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From what I can tell. This is a Hard Drive problem (notice the HDD in "HDD-1229"). You should back up all of your data and find a new Hard Drive.

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Ramon Ferreira zal eeuwig dankbaar zijn.

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