I have some photos from a previous computer that I have installed on my MacBook and imported into iPhoto. My problem is that when I actually open iPhoto these photos do not show up in the library as thumbnails. When I go through the process of importing them again I get an error message telling me they could not be imported because they are already in the iPhoto library file folder. Can someone please let me know how I can get them to actually show up in the library when I open iPhoto? Thank you!