If you have some experience administering computers, you may be able to identify and resolve some keychain problems by using Keychain First Aid.
With Keychain First Aid, you can:
- Verify and repair keychain settings and permissions
- Reset a keychain (delete a keychain reference while preserving the keychain file)
- Make the login keychain password the same as the login password
- Set the login keychain as the default keychain
- Set the login keychain to always remain unlocked