iMac Intel 27". EMC 2309 (Late 2009, Core 2 Duo 3.06 or 3.33 GHz), EMC 2374 (Late 2009, Core i5 2.66 GHz or Core i7 2.8 GHz)

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iMac very hot, soft grinding noise

Hi there! I have an office full of oldish Macs and one iMac (27", 2009, Yosemite) in particular that is acting up. Performance wise it is ok- no unexpected shutdowns, but it takes a long time to boot and occasionally hangs on a white screen. Just recently I noticed that the top left corner/back of the chassis is incredibly hot- like can't-keep-your-hand-on-it hot. The fan is running but not overly fast. Pressing my ear to the chassis I can also hear a soft grinding, it's hard to tell if it's an HDD noise or a fan noise. The Apple Hardware Test gave the error code 4MOT/4/4000003 HDD-1343 which I didn't see much of online. I have the tools in house to attempt most repairs. Is this a hard drive error like the code suggests? Why so hot?

Update (03/02/2016)

I ended up replacing the HDD fan on this machine using a little bit from iMac Intel 27" EMC 2390 Hard Drive Replacement and a little bit from iMac Intel 27" EMC 2309 and 2374 Teardown. Runs much cooler now!

iMac Intel 27" EMC 2390 Hard Drive Image


iMac Intel 27" EMC 2390 Hard Drive Replacement

Difficulty: Moderate30 minutes - 1 hour

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This does sound like a hard drive. Do a Time Machine Backup ASAP. Could be a failing drive but the heat sensor is just sticky stuffed on some drive and can fall off.

Have you ever been into it or blown out the fans?

See Dan's answer on this one: iMac Hardware Error 4MOT/4/40000003: HDD-1316

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Excellent, thank you.


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