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Model A1225 / Mid 2007 and Early 2008 / 2.4, 2.8, or 3.06 GHz Core 2 Duo processor

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Overheating after hard drive replacement

Within a few weeks of replacing my iMac's hard drive (following simple instructions here and on youtube) I noticed that the fan was always running fast (and loud). iStat showed that from a cold start, the GPU was up to 89 C and the GPU diode at 101 C within 15 minutes. All cools again slowly if the screen sleeps for long enough.

No ill effects, but very noisy fan in my dead quiet office. CPU fan runs constantly at c. 3300, which I understand to be close to max.

First I used canned air to clear the vents. No sign of dust expelled. No reduction in the above temps or fan speeds.

Second I removed the glass and the screen to access the fans, and cleared these with canned air. Some dust evident, but not a huge amount. No reduction in the above temps or fan speeds.

I was wondering of there was a knack to reassembly that's required to ensure airflow isn't compromised?

Any one else had these issues, or any thoughts on remedy?


Worth noting that I also took the whole unit to the local Apple store for a genius bar appt. The guy took it out back, claimed to have cleaned the vents in a huge loud of dust with an air can, said all was OK and that the CPU fan can spin up to 6000 rpm. Given the large amount of BS, I didn't feel too encouraged when he told me that the temps were fine and not to worry.

Отвечено! View the answer У меня та же проблема

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Выбранное решение

I have the same iMac, and I successfully upgraded the hard drive about 6 months ago.

Checking iStat on my iMac, I can verify for you that your 89 C is not at all normal.

My guess is that you accidentally missed a temperature sensor when you went to put your iMac back together. They are all over the place inside of the computer. If you miss one, it can cause the fans to behave erratically and it can mess with the temperature readings. There's even a temperature sensor on the hard drive. I trust you installed it with the new hard drive, but if you didn't then that would be your problem.

I'm certain it has something to do with the temp sensors. Double-check that you connected all of them properly, and if you didn't, doing so should 100% solve your problem. :)

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Many thanks. Appreciate the insight Tommy, I'll crack it open again and check the sensors.


+ Excellent advice, I looked at your site. Will be contacting you about some component level work if you want it


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