Q: iPhoto not responding

You should try rebuilding the iPhoto library as explained here.  iPhoto 6 and later: Rebuilding the iPhoto library - Apple Support

Try the following:

1 - delete the iPhoto preference file, com.apple.iPhoto.plist, that resides in your

     User/Home/Library/ Preferences folder.

2 - delete the contents the following folder: User/Library/Containers/com.apple.iPhoto

3 - reboot, launch iPhoto and try again.

If the above fails try this:

Using iPhoto Library Manager  to Rebuild Your iPhoto Library

1 - download iPhoto Library Manager and launch.>Click on the Add Library button,

2 -  select the library you want to add from those in the selection window.

3 - make sure that in the rebuild window the checkbox  "Scavange orphaned photos" is checked.

4 - now that the library is listed in the left hand pane of iPLM, click on your library and go to the Library ➙ Rebuild Library menu option

5 - in the next  window name the new library and select the location you want it to be placed. Click on the Create button.

Note 1: 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.

Note 2:  Your current library will be left untouched for further attempts at a fix if so desired.

Option 1

Back Up and try rebuild the library: hold down the command and option (or alt) keys while launching iPhoto. Use the resulting dialogue to rebuild. Choose to Repair Database. If that doesn't help, then try again, this time using Rebuild Database.

If that fails:

Option 2

Download iPhoto Library Manager and use its rebuild function. (In early versions of Library Manager it's the File -> Rebuild command. In later versions it's under the Library menu.)

This will create an entirely new library. It will then copy (or try to) your photos and all the associated metadata and versions to this new Library, and arrange it as close as it can to what you had in the damaged Library. It does this based on information it finds in the iPhoto sharing mechanism - but that means that things not shared won't be there, so no slideshows, books or calendars, for instance - but it should get all your events, albums and keywords, faces and places back.

Because this process creates an entirely new library and leaves your old one untouched, it is non-destructive, and if you're not happy with the results you can simply return to your old one.  

Regards

TD

I clicked rebuild and then what do I do? I click open iphoto and it takes me back to "choose a library"

I keep clicking iphoto and it keeps telling me to choose a library i choose one and will not open. I am very frustrated.

The library is damaged. Continue to my step two, above.

If it's the same issue then rebuilding with iPhoto Library Manager didn't work. Are you sure you did it correctly? Remember at the end of that process you will have two iPhoto Libraries. Do you?

This is the one I am opening and getting the same issue

How are you opening it?

What version of iPhoto do you have?

Try this way:

Hold down the option (or alt) key key and launch iPhoto. From the resulting menu select 'Choose Library'

Where is your Library stored?