Final answer:
The message "Chassis Intruded! System has halted." signifies that the computer's case has been opened. It's part of the motherboard BIOS security features to detect unauthorized access. The issue can be resolved by resetting the chassis intrusion status or disabling the feature in the BIOS settings.
Step-by-step explanation:
When you see the message "Chassis Intruded! System has halted." on your computer, it indicates that the case of the computer has been opened. This message is typically a feature of the motherboard's BIOS security settings, where a chassis intrusion detection option can be enabled to alert the user if the computer's case is opened. The purpose of this security feature is to prevent unauthorized access to the internal components of the computer.
This feature works by using a chassis intrusion sensor or switch that, when the case is opened, triggers an alarm in the BIOS, leading to the cessation of the boot process and the display of the alert message. To resolve this issue, one would usually need to access the BIOS setup utility upon startup and reset the chassis intrusion status or disable the chassis intrusion detection feature if deemed unnecessary. It's important to ensure that the computer's case is properly closed before turning it back on.