Gigabyte GA-X79-UD5 - Page 47

- 47 - BIOS Setup
Reset Case Open Status &
Disabled Keeps or clears the record of previous chassis intrusion status. (Default) 
Enabled Clears the record of previous chassis intrusion status and the  Case Opened
"No" at next boot.
Case Opened &
Displays the detection status of the chassis intrusion detection device attached to the motherboard CI

clear the chassis intrusion status record, set Reset Case Open Status to Enabled, save the settings to
the CMOS, and then restart your system.
PC Health Status `