Quote Originally Posted by Skink
it's hard to imagine what could of done that,,,I mean Linux doesn't have a system restore,,,Does it??? Lemme look into it you may just be able to reverse it...

Ok there seems to be a Disk Utility,,,did you mess with it yet???

Run Disk Utility:
If none of the previous suggestions worked, then it is time to move on to OS X??s built in disk utility. Go hunt around for your OS X install disk and pop it in your drive. Then restart your computer holding down the ??C? key until your machine boots from the disk and not your harddrive. Once here a screen will appear asking you to begin installing OS X, you don??t want to do this. Instead, look in the menu and find the Disk Utility option and click on it. This quits the installation and opens up the Disk Utility interface. Once here you will want to click on the repair disk option and watch as OS X is fixed before your very eyes!