My iMac hums, it is not fan related

Dear All,
My reliable trusty old 24 inch iMac (one of the first intel ones) has developed a hum, it is annoying as **** (i use it to make music) and I am wondering how I can tell what it is?
I've set my energy saver to allow hard drives to go to sleep and indeed, when that happens, the hum stops. It starts again when the computer wakes up. It's not the fans, they have a totally different sound.
Any ideas?
Thanks,
Martin

See if the hum changes with the intensity level of your display.
I had a hum develop in my 24" early 2009 iMac that changed with the intensity level. High intensity, no hum, low intensity--i.e. that needed to color calibrate the display for print matching--much hum. Apple replaced an assembly in the display circuitry and it has been hum free since.

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http://support.apple.com/kb/HT1939
http://support.apple.com/kb/HT1767
http://support.apple.com/kb/HT1379
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I reinstalled Mac OS X 10.5.6 Combo Update and the annoying humming sound coming from my iMac is gone,I have read alot of people were having the same problem with the Aluminum 24" model.

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[click on image to enlarge]
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My iMac hums, it is not fan related

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