Symptom
If you use a custom desktop picture, the keyboard layout changes to U.S. during startup. You may not be able to log in because typed characters do not match the keys on the keyboard.
Solution
Logging in
If your user name and password contains only numerals, use your keyboard's keypad to log in as expected, then go to "After logging in" below.
If you use any other character in your user name or password, refer to this U.S. keyboard layout graphic to find the equivalent keystrokes.
Figure 1 U.S. keyboard layout
After logging in
Use these steps to resolve the issue:
1. Rename the desktop picture you want to use. Be sure to include the filename extension. For example, the filename should end with ".jpg" if your picture is a JPEG file.
2. Select the image file again. For specific instructions, see technical document 106758, "Mac OS X: How to Change Your Desktop Picture".