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12. Reinstall the heat sink and fan assembly with the fan duct as shown. See “Replacing the heat sink and
fan assembly” on page 52.
Figure45. Reinstalling the heat sink and fan assembly with the fan duct
13. Reconnect all cables that were disconnected from the system board.
What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the replacement, go to “Completing the parts replacement” on page 71.
Replacing the cover presence switch
Attention: Do not open your computer or attempt any repair before reading and understanding the “Important
safety information” on page v.
This section provides instructions on how to replace the cover presence switch (intrusion switch).
To replace the cover presence switch, do the following:
1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Open the computer cover. See “Opening the computer cover” on page 32.
3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 32.
4. Locate the cover presence switch. See “Locating components” on page 11.
5. Disconnect the cover presence switch cable from the cover presence switch connector on the system
board. See “Locating parts on the system board” on page 12.
Chapter 5. Installing or replacing hardware 63