I'm trying to upgrade an aluminium unibody 13" macbook from a 250Gb FUJITSU drive to a Seagate Momentus XT 320Gb Hybrid drive. I've formatted the drive correctly and I swapped it, but when I restart with the installation disc inside it just won't show. When I selected the instalation disk and trying to lauch the install the system crashes and needs restart. The drive worked just fine in an external enclosure but once I put it into the computer, it wasn't recognized and won't show up at all. Any ideas what could be going wrong? Suggestions?