Dell OptiPlex 755 User's Guide - Page 170

NOTICE: Be careful when opening the computer cover to ensure that you do not accidentally disconnect cables from the system board. 3 4 2 1 5 6 1 drive-release latch 2 optical drive 3 power supply and fan 4 hard drive 5 system board 6 heat sink assembly Chassis Intrusion Switch CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide. NOTE: The chassis intrusion switch is standard on the ultra small form factor computer but is optional on mini tower, desktop, and small form factor computers; it may not be present on your computer. Removing the Chassis Intrusion Switch 1 Follow the procedures in "Before You Begin" on page 21. 2 Remove the computer cover (see "Removing the Computer Cover" on page 168). 3 Remove the hard drive (see "Removing a Hard Drive" on page 197). 4 Disconnect the chassis intrusion switch cable from the system board by using two fingers to squeeze the release mechanism on one side of the connector as you pull to disconnect the cable connector. 170 Small Form Factor Computer