24" iMac harddrive failures abounding!!!!!!

Question

Every one of our 24" iMac harddrives have failed over the past year.
Let me explain......
We have 20 - 24" iMacs, 18 - 20" iMacs. All purchaced in bulk in 2007 and 2008. We are basially a Mac shop that comprises of 30% Macs, the rest PC.
The first hardrive failure was in November of 2009. From that point till now we have had to replace 12 drives, all on the 24" iMacs. As a precation, we are replacing drives in two more iMacs that are out of warranty. Leaving 4 iMacs that are still under warranty.
Given the extent of the failures we are experiencing and regardless of any warranty, Apple should be replacing the drives for us. They won't because the one year warranty expired on many of these a few months ago.
Let me point out, that none of the 20" iMacs have had harddrive failures.
It is hardly a coincidence. This points to bad design and a failure for Apple to control quality. If someone from Apple wants to contact me about this, please do so through this post.

Answer 1

Yeah, I had to do a few HDD and even logic board replacements on Mid-2007 24" iMacs once upon a time. Strangely enough, people here didn't want to believe me.
It was at a university where they had two labs full of 20" models, and only a handful of 24" models, but only the 24" ones had a problem. Just be sure you catch it quick, because they will roast your logic board if you don't.
This is also why you should try to stagger your purchasing. Replace a few systems every month, so if there's a bad run of systems, you won't have a bunch of systems down at the same time.