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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hardware test 4MOT/4/40000003:HDD-1291 not sure what to fix

Dear everyone,

I think this is my final try to fix my old 2009 iMac.

The iMac fail to boot into the OS and reboot and hang itself. It was already a year.

I believe the main hardwares (monitor, cpu, graphic, ram) they are still in good condition. I was able to run Apple hardware test and got the error code as title. The end of the error code wasn't fixed, means sometime it will change but always look similar, 12xx kind of.

I did some google and people were suggesting about fan or heat issue. But I couldn't score the solid answer of how to actual repair (or if it can be repair at all)

I have good experience to change the iMac hard drive and made it dual HDD (ssd + HDD) by myself, but beyond that I never touch the main board. But I am OK to try, because if it cannot be repaired by myself I will trash it.

Thank you any of your input!

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Simon Kwan that code usually indicates that either your HDD maybe over-heating or the HDD fan cannot cool the drive. Most likely is that the HDD fan is failing. You could either replace it or try apps' like smcFanControl and run the the HDD fan on high for a few minutes and see if that clears up the code.

iMac Intel 27" EMC 2309 and 2374 Hard Drive Replacement

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First Steps


• Glass panel

• LCD panel

• Optical drive

• Optical fan

• Power supply

• IR board

• Logic board


1 Remove 1 T10 screw.

• 922-9236

2 Pull the fan straight up and off the guide posts.

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Simon Kwan will be eternally grateful.
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