2.4gHz iMac take apart question...

Hi,
I have a 2.4ghz 20" iMac. When started up from cold there is a horrible noise that seems to come from the bottom right hand corner of the machine - To the right of the Apple logo. I am sure its a fan and not the drive. Sooo... In no particular order...
1. Which fan is it please? Optical, Hard drive or CPU.
2. Where would one purchase any or all of the above? - Probably best from the UK as thats where I am.
3. I have all the required tools and most, I hope! of the knowledge. How long would you reckon this will take?
Thank you for any replies.
Regards.
Ian.

Your 20" 2.4GHz is what a Mid 07 or Early 08?
I see all three fans listed for the 2007 20inch, I didn't check for the 08 but there most likely the same..
http://www.thebookyard.com/index.php?cPath=34_122
Before you open her up, you might try using SMCFanControl and play with the speed of the HD fan to see if the noise is actually coming from it.
http://www.versiontracker.com/dyn/moreinfo/macosx/31029
If the fan sounds fine thru all speed ranges, then the noise may be coming from your HD.

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