Some newer desktop PCs have a sensor located inside their case that detects when the case cover is removed and sends a signal to the BIOS. An unauthorized person might open a PC case to temporarily remove a hard drive to copy its contents, or to reset the system's password. Intrusion detection alerts the authorized user when the case has been opened.
The Intrusion detection feature must be enabled in the system's BIOS. To enable Intrusion detection, in the BIOS settings, under System Security, select a setting for Chassis Intrusion. You can configure the option to display a message on the screen at startup, (Enabled) or make the message visible only from within the CMOS settings program (Enabled-Silent). Or you can set the option to Disabled.
If Intrusion detection is enabled during a legitimate case opening, in the BIOS settings, under System Security, Chassis Intrusion, select Reset.
To secure older systems, that do have the Intrusion detection feature in the BIOS, you'll need to install a chassis lock.
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