Model A1224 / Mid 2007 and Early 2008 / 2, 2.4, or 2.66 GHz Core 2 Duo processor

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Constant fan noise what is causing this?

Hi there,

After replacing the initial HDD with a Seagate 1TB SSHD while removing completely the optical drive (due to breakdown) there seems to be a constant fan noise from the right side.

Any suggestions?

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Please tell us your exact machine. Does it sound like it's going to take off and fly?


Thank you very much for the quick answer.

I'll give it a try with the optical drive sensor as I plugged everything out. Yeah I have all the parts of the old optical drive while I won't put a new one too.Fortunately, I plugged everything regarding the HD components.

I'll keep you posted.


Exact model is iMac 20" 7.1 or EMC 2133


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Hopefully you left the thermal sensor still connected that was on the optical drive when you pulled it. Review this IFIXIT guide: iMac Intel 20" EMC 2133 and 2210 Optical Drive Replacement jump down to Step 17 which goes into removing it to then put back on the new optical drive. If you didn't leave it plugged in the systems cooling management system (SMC) goes into fail mode pushing the fans to max RPM as it wants to make sure the system is not overheating.

Hopefully you can recover the sensor and put it back in even if you leave the optical drive out. Frankly, I would have just left it alone as now someone will likely drop a disk in without knowing the drive was pulled.

I should also point out there is a similar sensor on the HD which you can see in this guide: iMac Intel 20" EMC 2133 and 2210 Hard Drive Replacement Seen in Steps 18, 19 & 20 that likewise needs to be put back onto the new drive and reconnected as well.

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@dan I asked what machine he had because the one you picked 200-08 doesn't need the OWC sensor. I believe the 2009 does.


@mayer - He had 'EMC2133' in his title so I assumed that was what he had. If this is correct he doesn't need the OWC sensor. This series uses the stick-on sensor on both drives. I suspect when he pulled the optical drive out as junk he forget to put the sensor back in.

If this is not the correct system bad on me ;-{

Sorry I've been not as attentive as I'm normally. I've been working on a very large project the last few weeks. We'll be moving to MS Windows starting in Sept ;-{


@danj He must have added the EMC number, it wasn't there when I made my post, it was just listed as a 20" iMac.

I'm so sorry to hear that about Windows. Guess than means I'm going to have to take over the problem study on the new macs. I've kind of put that in your hands the last couple of years. I don't even know how, or want to turn a PC on. Will you be able to transition easily?


@mayer - Truthfully I dread it. It's going to take a lot more work to keep the systems running. I guess I got spoiled with OS-X/MacOS.

The hardware will be less of a chore as HP will take the lead on that. I also see the handwriting on the wall as I'm sure once the dust settles with the migration in about a year we'll get our walking papers and HP will take over (I've seen that before).

Not to worry ;-} I'm not disappearing. I'll do my best in answering the new gear.


After reassembling for the second time, adding the optical drive (not plugged due to disfunction) and connecting the thermal sensor, now it is perfectly working!


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Theo Nt will be eternally grateful.
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