Gigabyte AMD Socket AM2 Processor Motherboard GA-M55S-S3 User Manual page 27

18) CI (Chassis Intrusion, Case Open)
This 2-pin connector allows your system to detect if the chassis cover is removed. You can check
the "Case Opened" status in BIOS Setup.
19) CLR_CMOS (Clear CMOS)
You may clear the CMOS data to its default values by this header. To clear CMOS, temporarily
short the two pins. Default doesn't include the jumper to avoid improper use of this header.
Pin No.
1
Open: Normal
Short: Clear CMOS
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Definition
1 Signal
2 GND
Hardware Installation