I just got this iMac a few months ago, actually got it the day Leopard was released. I have had the Leopard upgrade DVD and finally decided to upgrade tonight. I pop it in and it restarts then when it comes back up with the Leopard background, says I need Mac OS X 10.4 or later to upgrade. Then it searches and says it cannot find version 10.4 so it cant upgrade. When I click "About this Mac", I am running version 10.4.11 So any ideas why I cant upgrade?