... I just knew there were issues of putting OSX on the first 2 iMacs. I never recommend putting OSX on any computer less than 500 MHz, but this is a special request from one of the residents teenage daughters. She has a small digital camera and wants to put them on a computer and she wants to play music from her CD's. ... I've successfully put OS X on the very oldest of iMacs. There is a firmware upgrade that you need to install FIRST on some machines. IT MUST BE INSTALLED UNDER OS9! Craig