Switched on my MBP last night, and it sat at the Apple logo with the timer spinning for several minutes before switching itself off. The good new is that I backed it up yesterday (Time Machine) before leaving home for work. The bad news is that I work away form home so I'm laptop-less for the week. By sheer dumb luck I happened to have an OS X Install disk for a MacBook on me and I booted from it to confirm if the disk was dead. I used 'Disk Utility' and to my surprise the OS X boot partition and the Boot Camp XP install where visible, and using terminal I verified that my data was still on the disk. Using a firewire cable I hooked it up to a MacMini I have in the living room and using Target Disk Mode on the MBP I copied all the data and applications I needed. I then booted it from the OS X Install disk and attempted to Repair the disk using Disk Utility, however I got the following error. Verify and Repair volume "Macintosh HD" Checking Journaled HFS Plus volume. Checking Extents Overflow file. Checking Catalog file. Missing thread record (id = 1084276) Incorrect number of thread records Incorrect number of thread records Checking multi-linked files. Checking Catalog hierarchy. Invalid volume file count (It should be 646598 instead of 646599) Checking Extended Attributes file. Checking volume bitmap. Checking colume information. Invalid volume free block count (It should be 20885304 instead of 24170987) Volume Header needs minor repair Repairing volume. Missing directory record (id = 1084276) The volume Macintosh HD could not be repaired. Error: Filesystem verify or repair failed. By booting from the MacBook Install DVD I can switch the MBP's startup disk, which means I can boot using the XP Boot Camp Install and XP works fine, but when I try to restart in OS X it won't can't boot into OS X. Is there anything else I can do to successfully boot into OSX, and if not can I use the MacBook Install disk (from a two week old unibody MacBook) on my unibody MacBook Pro? As it's all backed up this is far from being a disaster, but it would be extremely useful to bring my MBP back to life before I get home at the weekend. Cheers in advance!