Après recherche sur la KBase du site d'Apple, voici comment faire:
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There are two possible solutions:
I. Disk Utility or fsck
First, try using Disk Utility or fsck to verify and repair the disk. If the issue persists, try the second solution.
For information on using Disk Utility or fsck, please see:
Article 106214: "Mac OS X 10.0: Why, When, and How to Run fsck for File System Maintenance"
II. Removing Preference files
You can resolve this issue when started up from Mac OS 9.x or Mac OS X. You must navigate to the filepath /Users/<user name>/Library/Preferences and delete three files. Follow these steps:
1. Open the Mac OS X disk in the Finder.
2. Open the Users folder.
3. Open the folder named after the affected user.
4. Open the Library folder in that user's folder.
5. Open the Preferences folder in that Library folder.
6. Drag these files to the Trash:
7. If you are using Mac OS X, choose Log Out from the Apple menu.
8. Log back in as the affected user.
9. If you are working in Mac OS 9.x, restart the computer from Mac OS X and log in as the affected user.