I just bought a new Macbook 2.4 Aluminum. I had the pervious Black Macbook with a 320 HDD. I want to replace the 250 in my new Macbook with the 320giger. I've installed the drive and when I boot up, it just keeps shutting down and booting up and so on. Never reveals the Apple Logo.. I've also tried holding down the option key and it sees the drive as I can select it, but it again won't mount or something and just continues to reset it's self. The HDD worked fine in my old Black Macbook (sold yesterday), and I can see it when I connect it to my new Macbook through usb from an external enclosure. Any ideas or suggestions would be greatly appreciated. I called Apple and they did not have any answers for me and said they could not really support it as it was not the hard drive that shipped with the Macbook.. FYI the HDD that did ship with my Macbook works fine..