Q: iMac RAM

Where did you see this?

FWIW, Apple does not manufacture RAM; the RAM they use is third party.

Which country are you in so I can look at the warranty.

That is not true...the memory of the iMac, except for the new 21" models, is a user upgrade.  The 27" has a small door for you to do that upgrade.

Be sure to buy quality ram as iMacs are especially picky about their ram...I buy all of mine from OWC, http://www.macsales.com but also good is Crucial, http://www.crucial.com

So, where did you read what you quoted in your first post?

Here is the hardware warranty:

http://www.apple.com/legal/warranty/products/embedded-mac-warranty-us.html

Bascially, it says that if you cause damage doing something, that will void the warranty (and RAM is the only thing you can add in an iMac)

And, Apple shows how to install RAM

http://support.apple.com/kb/HT1423

They certainly wouldn't tell you how to do it if you weren't supposed to.....