Dell OptiPlex 755 User's Guide - Page 171

5 Slide the chassis intrusion switch out of its slot in the metal bracket, and then push it down through the square hole in the bracket to remove the switch and its attached cable from the computer. NOTE: You may feel a slight resistance as you slide the switch out of the slot. Replacing the Chassis Intrusion Switch 1 Gently insert the switch from underneath the metal bracket into the square hole in the bracket, and then slide the chassis intrusion switch into its slot until it snaps securely into place. 2 Reconnect the cable to the system board. 3 Replace the hard drive (see "Installing a Hard Drive" on page 199). 4 Replace the computer cover (see "Replacing the Computer Cover" on page 317). 5 If you are using a computer stand, attach it to the computer. Resetting the Chassis Intrusion Detector 1 Turn on (or restart) your computer. 2 When the blue DELL™ logo appears, press immediately. If you wait too long and the operating system logo appears, continue to wait until you see the Microsoft® Windows® desktop. Then shut down your computer and try again. Small Form Factor Computer 171