If iPhoto fails to load or crashes on startup, you may need to repair and rebuild you iPhoto library.

Method 1: Rebuild your photo library from automatic backup. Hold down both the Command and Option / Alt keys, and while doing so, launch iPhoto. In the dialog that opens up, choose to rebuild your iPhoto library. Select Repair the iPhoto Library Database and then open the repair options again and choose R ebuild iPhoto library database from. Right-click on the Library you'd like to change and left-click Properties. Select the Library location that you want as default, left-click on Set save location, and then left-click Apply. How to change the type of files a Library is optimized for in Windows 10. Each Library can be optimized for a specific file type (such as. If your Photos library is automatically updated with iCloud Photos, the entire contents of the library will re-updates with iCloud when the repair process completes. Bonus Tip: Create a new Photos Library. The other alternative way to repair the corrupted Photos Library is to create a new Photos Library on Mac.

To rebuild an iPhoto Library hold down the option and the command key and click on iPhoto to launch the application.

iPhoto will appear with the following dialog box.

Depending on what is wrong with your iPhoto library select one of these options.

Repair Permissions

Photos Rebuild Library

This is probably the best option to start with. If your computer was not shutdown correctly, there may be files that were left open at the time. Repair permission fixes this problem.

Rebuild Thumbnails

iPhoto may have missing or damaged temporary images that iPhoto needs. This option creates those images again.

Repair Database

If the photos in your library don't match what iPhoto thinks it should be, this option will fix that problem. iPhoto looks at what photos are in the library and updates its records accordingly.

Rebuild Database

If nothing else works, use this option. It may take a long time and you might lose information about the photos or albums. Try all of the other options before using this one.

Macos Photos Rebuild Library

Rebuild Photos Library Iphone

Photos Client Requested Library Rebuild