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Grunting iMac
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Grizzled Veteran
Join Date: Dec 2001
Location: Land of Enchantment
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My 2010 i7 iMac has started making a strange noise: a 3 sec grunt at ~510hz, with a 3 sec interval. It comes from the right side. It does not sound like any failing HD I've ever heard, and it's not the DVD drive, as I played a CD which did not affect the grunts a bit.
This is why I had misgivings getting an all in one machine that I can't easily open up and check out. Rats.
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Moderator  Join Date: Jun 2000
Location: inside 128, north of 90
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It doesn't sound good. Back up anyhow.
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Grizzled Veteran
Join Date: Dec 2001
Location: Land of Enchantment
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I am backed up, always!  I just wish I knew exactly what is wrong, the HD was replaced end of 10/11, I have an extra if needed. Just don't want to open the machine without knowing exactly what needs to be done, it's such a pain to open.
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Clinically Insane
Join Date: Oct 2000
Location: Los Angeles
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Well that's easy to troubleshoot. Boot from an external drive and unmount your internal. Wait for it to spin down, and if you still hear the sound it's obviously not your drive.
Simple!
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"The natural progress of things is for liberty to yield and government to gain ground." TJ
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Dedicated MacNNer
Join Date: May 2008
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I've heard the same from a failing optical drive.
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Moderator Join Date: Apr 2000
Location: Gothenburg, Sweden
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Could also be a failing fan that tries to spin up and then fails, but HD seems the likeliest option. You could check a teardown on ifixit to see if you can see what is located there.
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The new Mac Pro has up to 30 MB of cache inside the processor itself. That's more than the HD in my first Mac. Somehow I'm still running out of space.
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Professional Poster
Join Date: Mar 2003
Location: Down by the river
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Originally Posted by Nergol 
I've heard the same from a failing optical drive.
Yeah but that's usually ~511 Hz.
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Grizzled Veteran
Join Date: Dec 2001
Location: Land of Enchantment
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1. Mods, please do something about previous post which totally derails my point. Thanks.
2. Did what Big Mac suggested, noise persisted, but then I realized that I could not eject the disk afte successfully unmounting the volume. Since the disk was available for verify and repair, is it not still active?
3. The noise has a constancy that seems to give credence to Ps fan idea, it's dull, as opposed to the higher pitched chittering HDs make. In fact it seems totally independent from the actual HD's modest sound. and Negrol, the optical drive played a CD fine, again while the noise did its thing.
I don't mean P's post, the one before
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Last edited by jmiddel; Apr 20, 2012 at 06:32 PM.
Reason: was not aware of Ps post)
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Addicted to MacNN
Join Date: Jan 2003
Location: Great White North
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Play both a DVD and a CD to rule out the optical drive. There is 2 sets of lasers.
Addition, Burn a CD and Burn a DVD as well. Modern drives might only have 1 laser to read DVD and CD and 1 laser to burn.
Could you record the sound and post that?
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Last edited by Athens; Apr 20, 2012 at 07:08 PM.
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Blandine Bureau 1940 - 2011
Missed 2012 by 3 days, RIP Grandma :-(
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