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Model A1200 with 2.16 or 2.33 GHz Core 2 Duo processor

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24 in iMac fan running constantly after replacing hard drive

How do I run diagnostics.

the "d" key isn't working on boot up.

This is after replacing the hard drive.

I believe that everything is connected.

Need to look again.

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were you trying to run diagnostics with the D key?

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I believe these iMacs also have heat sensors on the original drive. If it does, then you need to install that heat sensor on your new drive. If the logic board is not getting a reading from this sensor it'll cause ur fans to blare at full speed. Read this.

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+ nice link

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Hi, its a temp sensor apple puts in their hard drives thats not present in other drives not from apple. There is software designed to deal with this problem, its not free but works well. The website also explains the problem,

The software is iMac HDD Fan Control, the website is www.hddfancontrol.com.

Oh and there is a free demo to see if it works for you.

EDIT:

Sorry I did not realize the age of the question.

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Just found this. Saved me. HDD Fan Control worked perfectly. I guess the age of the post doesn't matter. :) Still great information.

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Wow... I have to second Harry's advice above about the iMac HDD Fan Control application. After taking my 21.5" iMac apart twice and making sure I replaced all the connections, I was ready to go back and install the original drive because I just couldn't tolerate the hard drive fan running at 5200 rpm all the time. My wife could hear it in the room next door.

Then I read about the temperature sensor on the Apple drive (doh)... but this application is golden. For $30 it saved me even having to open my iMac back up. And there's a DEMO! Now that's instant gratification for you. I didn't suspect this was a problem that could be solved by software. Thankfully I was wrong.

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30$ is just too much. A fix from Apple would be nice.

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I'll bet it works great, but $30 is way, way too much for this. If it was $5, I would have snapped it up in a heartbeat, but not 6x that. No way.

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Funnily I had the same problem.

My solution was pretty easy - in the end. I was far too cautious in placing the RAM into the Mac. So the connection was not 100% ok. Just taking them out & plug them in.

For me this did the job completely.

In case it won't do for you; it's just 5 minutes of work ^^

Klaus

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You rock Harry. I replaced the drive in my mom's iMac (17" Intel) a while back and it was fine at first but appears the sensor failed or lost connection resulting in full speed fans. I couldn't find the problem for the life of me until I came here.

Thanks to HDDFanControl it's back to normal while still protecting the machine. If you just defeat the sensor you're losing protection, HDDFanControl uses SMART to get the drive temperature and keep your machine protected. Plus you get to demo it for an hour to see if that solves you're problem or if there's more to it than that, couldn't ask for a more elegant solution.

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You can use the optical drive sensor from a 2009 and newer iMac to send temp info on the 2010 and 2011 logic boards. Just compare the HD sensor jack on the logic board to the optical drive sensor jack and you will find the right one. The sensors are cheap, usually about $20 and will report skin temp on the drive cabinet adequately enough to keep the internals cool without over-revving the fan

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https://www.crystalidea.com/macs-fan-con...

$15.00 and allows you to control more than one fan!

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Has anyone else reseated ram to correct this issue. I have all my sensors plugged including hdd sensor… still loud fan noise mid 2010 imac

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Bob さん、ありがとうございました!
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