I've seen a few posts that circle around an issue I'm having with my late 2007 White Macbook. Recently, during a backup, the HDD appeared to have failed and when I brought it to my local Apple Retail Store the technician confirmed that the HDD had failed and handed it to me suggesting I get some quotes from data recovery specialists... but I digress. After realizing that the incomplete backup contained most of the data that I truly cared about I purchased a new 320gb Seagate internal HDD and installed it. However, when I power the computer up with the Snow Leopard disc installed the disk utility does not recognize an installed HDD. So, I'm wondering what else could be wrong that would cause the HDD not to be recognized. I tried reinstalling it, ensuring that it was mounted in the case properly, but once again the OS install utility fails to find it. Is there a size limit for what the Macbook can handle? It originally shipped with a 120gb HDD. Any suggestions will be greatly appreciated.