My Intel iMac (Jan. 2006) was lacking something when I first got it. I wanted massive internal storage. Sure, I could have ordered a bigger HD from Apple, but where’s the fun in that? This pictorial guide covers the disassembly of the iMac.
NOTE: This procedure will probably void your warranty with Apple. I would advise that those who think this task will be out of their realm to have Apple do it. Proceed at your own risk!
11/9/2006
It has come to my attention that Apple CANNOT void your warranty by replacing a user serviceable part such as the HD due to an FCC regulation. If we couldn’t replace the HD ourselves the manual would say “no user serviceable parts inside”.
Also: This procedure should work for Core duo 2 iMacs as well...