Computer Components Software

What Is Chassis Intrusion

Chassis Intrusion: Your Computer’s Built In Security Feature

At its core, Chassis Intrusion is a system designed to detect if someone has opened your computer case (the chassis). This is a security and monitoring feature found on many desktops and servers.

How It Works

The Switch: A small switch is built into the computer’s case. When the case is closed this switch is pressed down. If the case is opened the switch springs up.

BIOS Connection: This switch is linked to your computer’s motherboard and monitored by the BIOS (Basic Input/Output System).

Triggered Alert: When the BIOS detects the switch has changed state (case opened), it registers a Chassis Intrusion event.

What Happens When Intrusion is Detected

The specific behavior depends on how your system is configured:

Logging: The most basic function is to log the intrusion event in the BIOS event log for later review.

Warning Message on Startup: Your computer will display a warning message during boot showing you that the case was opened.

Preventing Boot: In high security setups the computer might even refuse to boot until the intrusion issue is acknowledged or resolved in the BIOS.

Alerts: Some systems support sending network alerts or triggering other actions when an intrusion is detected.


Tampering Prevention: In servers or sensitive workstations, knowing if the case has been opened is important for security audits and detecting unauthorized modifications.

Warranty Tracking: Some manufacturers utilize the Chassis Intrusion log to track unauthorized repairs that voided or might void their warranty.

Managing Settings

Most BIOS settings offer options to enable/disable Chassis Intrusion detection and adjust how the system reacts to a detected intrusion. Sometimes if it’s annoying and you don’t need it you can just turn it off completely.

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