Gigabyte GA-Z77X-UD3H User Manual page 46

PC Health Status
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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

"No" at next boot.
Case Open
&
Displays the detection status of the chassis intrusion detection device attached to the motherboard CI
header. If the system chassis cover is removed, this field will show "Yes", otherwise it will show "No". To
clear the chassis intrusion status record, set Reset Case Open Status to Enabled, save the settings to
the CMOS, and then restart your system.
BIOS Setup - 46 -
Case Open field will show