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First we want to make sure, that the old iPhoto library is still there....there means in yourUsers folder.So goto Macintosh HD (home disk), open the folder named Users and you can a folder with your Username (eg: Scott), so open it, then Pictures folder and you can see the iPhoto library in there (must select old library).Right Click (control +click) on it and choose Show Package Contents from the pop-up, now iPhoto library will be open in Finder. Now, you can see a folder named "Originals".Then open iPhoto (from the dock or from Applications) while holding down the option key. Choose create new library and create a new library with different name (name must be different and not the same of old library). Now hide iPhoto (just hide it into dock and don't close it)Then from finder, drag the originals folder into iPhoto icon on the dock and all the files will import into your new library.