New iMac Noise

Hi all.
2 weeks ago my new 20" Nvidia iMac was delivered. I was replacing a Rev A G5 17" iMac. I noticed that the noise the machine makes whilst quieter is not 'really' quiet like my dad's 24".
The HDD fan speed is around 1600 and the noise does appear to be coming from the drive.
Has anyone else noticed a similar problem with theirs or do you think I should contact somebody about it?
I bought the machine from PCWorld's UK online website (OK I would have preffered to get it from apple but there was a pricing error I was able to take advantage of saving me quite a bit).
Eitherway i'm not sure PCWorld would overly interested so would it be OK to take it to an Apple Store if you think it's worth taking at all?
Any idea's are greatly appreciated.
Thanks.

Hi David. I have not used one of the new iMacs yet so all I can speak for are the ones that I have seen. The 17" iMacs at my work have a default HDD fan speed of 1200rpm. What can sometimes happen if you change the fan speeds then uninstall SMCFC when you reinstalled the fan controller it takes whatever the current fan speeds are as the default. So in order to fix that you would have to uninstall the fan controller, do a proper SMC reset, then reinstall SMCFC.
17" 2.16GHz CD2
ODD: 1000
CPU: 1000
HDD: 1200
20" 2.16GHz CD2
ODD: 800
CPU: 800
HDD: 1400
24" 2.33GHz CD2
ODD: 600
HDD: 1300
CPU: 1000
20" 2.0GHz ALU(2007)
ODD: 1000
HDD: 1200
CPU: 1200
24" 2.8GHz Extreme(2007)
ODD: 700
HDD: 1200
CPU: 1200
24" 2.8GHz-3.06GHz ALU(2008)
ODD: 700
HDD: 1200
CPU: 1200
George

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