Hi everybody.. I have a problem! My girlfriend's MacBook Pro w/ OSX 10.4 and I think a 2gig processor with 1.5gig memory stopped fully booting up because of an invalid sibling link (says diskutil) and her computer shuts off while backing up her data to an external HD in Target Disk mode (connected to my MBP). It hangs at the grey apple and spinning disk, and then after a couple minutes, it gives the 'no symbol'. I inserted the appropriate Mac OS X Install 1 CD to do archive and install and held C-- same thing happens. Tried the same with TechTools deluxe CD. Tried to boot in Safe mode and single-user, same thing. Resetted PRAM, and NVRAM... Option lets me click the Macintosh HD but it still hangs at grey apple and spinning disk. Target disk mode works though, so I try running Disk Utility on her volume-- it gives me the following: Checking HFS Plus volume. Checking Extents Overflow file. Checking Catalog file. Invalid sibling link Volume check failed. Error: The underlying task reported failure on exit 1 HFS volume checked 1 volume could not be repaired because of an error So I tried all of the above AGAIN. To no avail. SO, I decided to just go ahead and back up her drive-- I connected her MBP to my MBP in Target Disk mode and tried to transfer her files to the external HD I had hooked up as well-- after maybe two hours, her MBP had just shut off. It was connected to it's power cord.. What should I do? I need to back up her data but I can't in TDM because it shuts off. It's 90 gigs worth of data. I could also Archive/Install from my MBP with hers in TDM but obviously it would shut off. How should I back up her data? I also need to figure out if she should drop $100 on DiskWarrior and pray, or go ahead and get a new hard drive.