Hi, I have a Macbook Pro 2.16ghz 1 GB DDR2 90GB H/D The Macbook Pro, crashed and then loaded up with a Flashing Question mark that stays flashing. I have tried Disk Utilty and It its giving me INVAILD TREE B NODE and not allwoing me to verify or repair the disk. Its registering the H/D as Verified and Unmounted. When I plug it into another Mac, it will not register as a external harddrive but will still appear in the Disk Utility. I have tried everything including the Boot Leopord 10.5.1 CD's and Still no harddrive is there. If you could help, that would be great. The only option is to Format, and I need work on the HD. Hope you can help!!