If you upgrade to Mac OS X 10.4, 10.4.1, or 10.4.2 from an earlier version of Mac OS X, and continue to use an existing user account whose password contains high ASCII characters (those that can be typed using the Option key), Mac OS X 10.4 may start up to a blue screen if you have automatic login enabled. If automatic login isn't enabled (you get the login screen), you may be unable to log in if your password contains high ASCII characters.
Note: High ASCII characters are "extended ASCII" characters that you typically type using the Option key. They are listed in table II of this webpage, and include the following characters: å ß ∂ f Δ ... æ Ω ≈ ç √ ∫ ~ µ ≤ ≥ ÷ oe Σ + ¥ ø π Å TM ® ©
To resolve the issue, update to Mac OS X 10.4.3 or later. Note: This issue can still occur when switching users via Fast User Switching and using a high ASCII character in a password, even if 10.4.3 or later is installed.
This issue can also occur (in Mac OS X 10.4 through 10.4.2) if you change your password in Accounts preferences and use high ASCII characters.
Tip: If you're setting up a new account in Mac OS X 10.4, such as when you get a new Mac, use Setup Assistant to set a password that does not contain any high ASCII characters. Otherwise, the Finder and desktop won't appear when you finish the Setup Assistant; you'll see only a blue screen.
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