Replacement 20" iMac Constantly Humming

Hello
I have just received my replacement 20" aluminium iMac. I have had it replaced as the screen had the known gradient problem where its brighter at the bottom and darker at the top.
Well first of all, the gradient problem is still there in this one, I knew this would happen as everyone else with the issue reported it range-wide, despite Apple recommending a replacement.
But what's worse, this replacement model is producing a significantly loud humming noise coming from inside the machine which sort of 'throbs' or 'pulsates'. I am so unhappy at the moment! I am already unsure what to do with the gradient issues, and now this!
I understand many have reported the 24" iMac producing humming noises, but I am yet to see anyone with a 20" iMac report this, as well as the fact that the humming is fading in and out.
If anyone else is having this same problem with the 20" iMac, please do tell! And is there a way of fixing the issue? Or does it look like this one has to go back as well? If it does, then I will be asking for a refund as this is just totally unacceptable quality for Apple.

I would install iStat Pro and look at your fan speeds. The normal speeds are around:
CPU Fan 1200 RPM
Hard Drive 1200 RPM
Optical Drive 999RPM
If they are way different than these, then look into SMC Fan control to see if lowering your fan speed helps. BUT watch your temperatures using iPro. I thought my iMac was humming but it turns out that everything was within specs and that my den is very silent so any noise seemed out of place. Good Luck
Message was edited by: musashi88

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