What exact iMac are we talking about?
Do you have some kind of home insurance that can cover the possible repair? www.ifixit.com has a lot of guides and parts (though a bit more expensive than other sources like eBay) on how to repair almost every aspect of Macs.
If it is a 24" iMac bought in 2008, it is not a G5 iMac (if that is what you mean with - ah you edited your post, why does it say "iMac 2006" now?), then try this: http://www.ifixit.com/Mac-Parts/iMac-Intel-24"
For further information about "EMC" numbers, expand "every system" here.