MSI MS-7191 - Jumpers; Clear CMOS Jumper: JCMOS

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Hardware Setup
The motherboard provides the following jumpers for you to set the computer’s
function. This section will explain how to change your motherboard’s function through
the use of jumpers.
Jumpers
Clear CMOS Jumper: JCMOS
There is a CMOS RAM onboard that has a power supply from external battery
to keep the data of system configuration. With the CMOS RAM, the system can
automatically boot OS every time it is turned on. If you want to clear the system
configuration, set the JCMOS1 (Clear CMOS Jumper ) to clear data.
JCMOS
1
Clear Data
1
3
Keep Data
1
3
MSI Reminds You...
You can clear CMOS by shorting 2-3 pin while the system is off.
Then return to 1-2 pin position. Avoid clearing the CMOS while the
system is on; it will damage the mainboard.