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Model A1312 / Mid 2010 / 3.2 GHz Core i3 or 2.8 & 3.6 GHz Core i5 or 2.93 GHz Core i7, ID iMac11,3

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Loud fan noise even after installing OWC Thermal Sensor Kit

Really hope someone can help me with this, as I’ve tried all the options I can think off!

So, I upgraded my 2010 iMac 27 with an i7 CPU & added a 120GB SSD as a boot drive using OWC’s Thermal Sensor Kit. For the first month, everything worked fine, however, one day as soon as I turned the iMac on, I just started hearing really loud fan noise & couldn’t figure out why. I opened the system & checked every cable, but no joy!

Finally contacted OWC technical support, they couldn’t figure it out either & sent a replacement kit 3 times thinking there could be a faulty sensor cable, but the problem still persists.

I also tired SSD Fan Control & iSat fan control apps, that has made no difference in the fan speed!

I am really not sure what else I could try? Any suggestions, please?

Not sure if this would make any difference, but it’s mainly the left fan which makes the loud noise.

Appreciate any help.

Thanks.

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Sounds like your system is in Safe Mode. This is when SMC perceives a failed sensor which could be either a thermal sensor or a voltage sensor.

While the OWC in-line sensor is one of the sensors, it sounds more like you have a different one failing here.

Can you run the onboard diagnostics? Restart your system and press the D key. Depending on your OS you might get a EFI error.

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Hi Dan, thanks for your reply, I managed to run Apple Hardware Test via USB boot & the error code I got was - 4m0t/4/40000003: HDD-1318.

I tried looking up the error code, but couldn't find any answers.

Please, can you help? thanks.

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Hi Dan, sorry, only just saw your reply, thanks so much! I'll look into these diagnostics & let you know if it solves the problem! Thanks, again..

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@panmetrix - You need to replace the HD fan which the first link I posted.

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Hi Dan, yes, I've ordered the HD fan now, hopefully that should sort it, thanks again!

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Pawan Porje zal eeuwig dankbaar zijn.
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