Mac OS X 10.5 (Leopard) Password Problem
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If your local password (not your Access Account password!) is greater than eight characters, and you've upgraded your Mac from OS X 10.2, and you haven't changed your password since OS X 10.2, then Leopard won't let you log in.
To prevent this from occurring, the Computer Store recommends backing up all documents and important information, formatting the hard disk and installing a clean copy of OS X 10.5.
Apple has now provided *Login & Keychain Update 1.0 for Mac OS X 10.5 Leopard*. This is said to address:
- Logging in with an account originally created in Mac OS X 10.1 or earlier that has a password of 8 or more characters.
- Connecting to some 802.11b/g wireless networks.
- Changing the password of a FileVault-protected account.
For more information please visit Apple's article: http://docs.info.apple.com/article.html?artnum=306840