Gigabyte MZ73-LM0 User Manual page 33

19) CASE_OPEN (Case Open Intrusion Alert Header)
This motherboard provides a chassis detection feature that detects if the chassis cover has been removed.
This function requires a chassis with chassis intrusion detection design.
20) LED_BMC (BMC Firmware Readiness LED)
Open: Normal Operation (Default)
Closed: Active Chassis Intrusion Alert
Hardware Installation
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State Description
On BMC firmware is initial
Blink BMC firmware is ready
Off AC loss