[Motherboard] Introduction to the Chassis Intrusion Detection Function
The chassis intrusion detection function is provided for computer chassis designs that include an opening detection feature.
Note: It must be used in conjunction with an external detection device such as an opening detection sensor or a microswitch.
When this function is enabled, if you make any movement of the chassis components, the chassis sensor will immediately detect it and send a signal. The BIOS will record this chassis opening event and display a prompt on the POST screen during startup:
As shown in the following image: 
Table of Contents:
One. How to determine whether the motherboard supports the Chassis Intrusion Detection function?
Two. How to enable this function in the BIOS?
Three. Q&A
One. How to determine whether the motherboard supports the Chassis Intrusion Detection function?
(The following is an example of a motherboard: ROG STRIX Z890-E GAMING WIFI)
1. Click the search function on the top right corner of the ASUS official website, enter the model name of the motherboard you wish to confirm, and then click on it. 
2. Click the [Tech Specs]page, as shown in the following image: 
3. In the [INTERNAL I/O CONNECTORS] field, the text "Chassis Intrusion header" is written, indicating that this model supports this function, as shown in the following image: 
Two. How to enable this function in the BIOS?
1. After the computer is powered on, immediately press the "delete" key on the keyboard to enter the BIOS [EZ Mode], as shown in the following image: 
2. Press the F7 key on the keyboard to enter [Advanced Mode], and then select the [Chassis Intrusion Detection Support] option on the [Monitor] page. as shown in the following image: 
3.Set [Chassis Intrusion Detection Support] to Enabled, as shown in the following image: 
4. Press the F10 key to save and restart. The BIOS settings have been completed.as shown in the following image:
Three．Q&A
Q: The Chassis Intrusion Detection Support option has been enabled in the BIOS, but the prompt still appears: The computer case is open. Please ensure that the computer case is properly closed and then press CTRL+ALT+DEL to continue. Fatal Error. How to troubleshoot?
as shown in the following image:
A：
1. Confirm whether this pins of the chassis have been correctly installed onto the motherboard. For example, for the function of this feature on the motherboard ROG STRIX Z890-E GAMING WIFI, the connection position is shown in the red box in the following figure:
Note: The connection positions of this feature may vary depending on the different motherboard models. For specific details, please refer to the actual positions described in the user manual. 
2. Confirm whether this function has been successfully enabled in the BIOS. Refer to the previous section: How to enable this function in the BIOS