iMac Intel 27" EMC 2309 (Late 2009, Core 2 Duo 3.06 or 3.33 GHz) ID iMac10,1, EMC 2374 (Late 2009, Core i5 2.66 GHz or Core i7 2.8 GHz) ID iMac11,1

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background noise of constant frequency

Since new (early this year) my iMac 27 iCore7 makes a constant noise in the background (not linked to disk activity).

It sounds a bit like a noisy power transformer, or could be a fan revving noisy, but with continuous speed. iStat doesn't show anything special in terms of temperatures or fan speeds and when these vary the noise isn't changing.

Noise vanishes when I put my Mac on sleep and resumes when I wake it up.

Anyone else experiencing this ?

Thanks for advice.

Answered! View the answer I have this problem too

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4 Answers

Chosen Solution

Record the noise and save it. Then email it to Apple along with your request for a FedEX shipping box. Apple is obligated to service your machine while under warranty and pay for the shipping.

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As it's still under warranty i'd take it back to the shop.

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As my shop is the AppleStore and I'm not living close to any large town I'm just trying to find out whether I'm too "noise sensitive" or if it's a genuine issue, before sending back my machine to the Applestore.

It's difficult to let the AppleCare guys hear my noise through phone lines...

Thanks for the advice, anyway.


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Seems like this problem.

I have it myself and is pursuing a fix myself, so if anyone got a fix for it, please share

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I got mine fixed, well, the workshop changed the led backlight board, but same problem. Still high pitch whine between 30-90% brightness.

Its been on workshop 2nd time, and they said they have contacted apple and got the answer: Thats just how this model is... i mean, come on...

so, sending it to repair most likely wont fix the problem :-S

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Jacques Lacroute will be eternally grateful.
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