Installing the intrusion switch
1. Insert the intrusion switch into the slot on the chassis.
2. Connect the intrusion switch cable to the system board.
3. Install the:
a. fan duct
b. cover
4. Follow the procedure in After Working Inside Your Computer.
Removing the SD card reader
1. Follow the procedure in Before Working Inside Your Computer.
2. Remove the:
a. cover
b. front bezel
c. hard drive assembly
d. optical drive
e. power supply unit
3. To remove the SD card reader:
a. Remove the power supply unit cables from the retention clips on the SD card reader enclosure 
[1].
b. Remove the screws that secure the SD card reader and lift it away from the computer [2] [3].
23