Dell OptiPlex 755 User's Guide - Page 274

Physical Security Chassis Intrusion Detection NOTE: When the administrator password is enabled, you must know the administrator password before you can reset the Chassis Intrusion setting. This (optional on some computers) feature, if installed and enabled, detects that the chassis was opened and alerts the user. To change the Chassis Intrusion setting: 1 Enter system setup (see "Entering System Setup" on page 280). 2 Press the down-arrow keys to move to the System Security option. 3 Press to access the System Security option's pop-up menu. 4 Press the down-arrow key to move to the Chassis Intrusion setting. 5 Press to select an option setting. 6 Press again after you update the option setting. 7 Exit and save system setup. Option Settings • On - If the computer cover is opened, the setting changes to Detected, and the following alert message displays during the boot routine at the next computer start-up: Alert! Cover was previously removed. To reset the Detected setting, enter system setup (see "Entering System Setup" on page 280). In the Chassis Intrusion option, press the left- or right-arrow key to select Reset, and then choose On, OnSilent, or Off. • On-Silent (default setting) - If the computer cover is opened, the setting changes to Detected. No alert message appears during the boot sequence at the next computer start-up. • Off - No intrusion monitoring occurs and no messages appear. Padlock Ring and Security Cable Slot Use one of the following methods to secure your computer: • Use a padlock alone or a padlock and looped security cable with the padlock ring. A padlock alone prevents the computer from being opened. A security cable looped around a stationary object is used in conjunction with a padlock to prevent unauthorized movement of the computer. 274 Advanced Features