3912 Views 1 Reply Latest reply: Aug 10, 2010 1:51 AM by R C-R
Restart from your installer disc. Do not run the installer. Instead, from the Utilities menu select Disk Utility & run its Repair Disk step. If it can repair the HD, try reinstalling the OS again. If it cannot, you can try a more powerful (& expensive) disk repair utility like Disk Warrior, which may or may not be able to repair the damage. Otherwise, you will need to reformat the HD (losing all its data) to recover.
You should always have a backup of your data. If you do not, it may be worth gambling on the price of Disk Warrior, but remember that there are no guarantees it can repair the damage.