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If Keychain First Aid finds an issue that it can't repair, or if you don't know your keychain password, you might need to reset your keychain.
Resetting a keychain sets aside the original default keychain file and creates a new one.
To reset your keychain in Mac OS X 10.4, Mac OS X 10.5, and Mac OS X 10.6 Snow Leopard or later:
- Open Keychain Access, which is in the Utilities folder within the Applications folder.
- From the Keychain Access menu, choose Preferences.
- Click General, then click Reset My Default Keychain.
- Authenticate with your Mac's account login password.
- Quit Keychain Access.
- Restart your computer.