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Nov 12, 2013 4:09 AM in response to jimmytantanby Baby Boomer (USofA),Which model iMac do you have? http://support.apple.com/kb/HT1758 How to identify iMac models
If you are still under warranty and/or have AppleCare, call them. Let them deal w/it. -
Nov 12, 2013 7:24 AM in response to jimmytantanby Linc Davis,First follow the instructions in this support article.
If an iPhoto or Aperture library is the source of your desktop pictures, it may need to be rebuilt, or you may need to update the application to the latest version.
Otherwise, continue as below.
Back up all data.
In the Finder, hold down the option key and select
Go ▹ Library
from the menu bar. From the Library folder, delete the following item, if it exists:
- Caches/com.apple.systempreferences
and move the following items to the Desktop, if they exist:
- Application Support/Dock/desktoppicture.db
- Preferences/com.apple.desktop.plist

