How did you "transfer" the library
Moving the iPhoto library is safe and simple - quit iPhoto and drag the iPhoto library intact as a single entity to the external drive - then move the EHD ot the new computer and drag the iPhoto library intact as a single entity to the pictures folder of the new iMac and launch iPhoto on the iMac - it will open and convert the library as needed
And be sure that the External drive is formatted Mac OS extended (journaled) (iPhoto does not work with drives with other formats)
And backup soon and often
Thanks for answering !:)
We did drag the iPhoto library (after shuting down iPhoto), to the external hardisk, and thereafter plugged the hardisk on to new iMac, and dragged iPhoto library to the new iMac. The hardisk is an old one, and was formatted on a PC, but as we managed to store the minimac iPhoto library on it, it should be ok? However - on my new iMac - iPhoto, it seems like the pictures are in the background, as the information of numbers of pictures in each "happening" (dont know if this is the correct english word), shows. The information of picture-size also shows in information field Only the picture itself does not show. In addition it seems like only part of the pictures are copyed, as my origin library consits of 24 000 pictures, and only 4 000 is numbered up, (but does not show...) in iPhoto on new machine.
I am wondering if the different versions of iPhoto, or different versions of OS x is disturbing the process? Or if it is lack of file-information during the transfer to external hardis that is the problem ? Else, I just have to give it another try..
The most likely issue it using the PC formatted disk - - give it a try on a correctly formatted drive
be sure that the External drive is formatted Mac OS extended (journaled) (iPhoto does not work with drives with other formats)
or another connection - newtwork, direct wire or other way to connect the systems and drag the iPhoto library accross without an intermediated storage location
Try this: make a temporary, backup copy of your library if you don't already have a backup copy (Control-click on the library and select Duplicate from the contextual menu) and apply the two fixes below in order as needed:
Launch iPhoto with the Command+Option keys held down and rebuild the library.
Since only one option can be run at a time start with Option #1, followed by #3 and then #4 as needed.
Using iPhoto Library Manager to Rebuild Your iPhoto Library
1 - download iPhoto Library Manager and launch.
2 - click on the Add Library button, navigate to your Home/Pictures folder and select your iPhoto Library folder.
3 - Now that the library is listed in the left hand pane of iPLM, click on your library and go to the File ➙ Rebuild Library menu option.
4 - In the next window name the new library and select the location you want it to be placed.
5 - Click on the Create button.
Note: This creates a new library based on the LIbraryData.xml file in the library and will recover Events, Albums, keywords, titles and comments. However, books, calendars, cards and slideshows will be lost. The original library will be left untouched for further attempts at fixing the problem or in case the rebuilt library is not satisfactory.