If some of the expected icons don't show up in the System Preferences application, this document explains how you can fix it. This document applies to Mac OS X 10.0 through 10.2.8.
To see System Preferences icons:
1. Quit System Preferences.
2. Click the Finder icon in the Dock.
3. Choose Go > Go To Folder.
4. Type: ~/Library/Caches
5. Click Go.
6. Locate this file: "com.apple.preferencepanes.cache"
7. Drag it to the Trash.
8. Open System Preferences.