iMac Intel 27" EMC 2309 (Late 2009, Core 2 Duo 3.06 or 3.33 GHz) ID iMac10,1, EMC 2374 (Late 2009, Core i5 2.66 GHz or Core i7 2.8 GHz) ID iMac11,1

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Apple hardware test 4MOT/4/40000003:HDD-1244

Hi again just ran a hardware test on my 27" Imac and came up with 4MOT/4/40000003:HDD-1244 does anybody know what it refers to.

thankyou Mark

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Have you changed the hard drive? Please tell us your exact machine.


Hi Mayer I have a late 2009 iMac 27" and yes the hard drive has been replaced about a few years ago.


What was the test's exact name.


Vader, that's the AHT Apple Hardware Test.


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Been listening to that run away fan for a long time now ;-) Loud, isn't it!

Here's what you need to fix the problem:

OWC In-line Digital Thermal Sensor for iMac 2009-2010 Hard Drive Upgrade

Apple used priority heat sensors on this series of machines.

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Thanks I check it out, going to open it up soon. I am wondering if this has anything to do with random black screen. I keep you posted if it also resolves the issue. Thanks


Black screen is most likely a separate issue. Hook it up to an external monitor when that happens and see if the GPU is generating a signal. It may need a reflow.


I have done the torch test and I can see the desktop images some have suggested LCD convertor. also what do you mean by 'need a reflow'?


Work over the LED driver board looking for a cold solder:

, that failing, replace it: iMac Intel 27" EMC 2309 and 2374 LED Driver Board Replacement


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mark.mcgivern will be eternally grateful.
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