MSI MS-7255 User Manual page 23

20
Clear CMOS Jumper
There is a CMOS RAM onboard that has a power supply from an external battery to keep
the data of system configuration. W ith 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
jumper to clear data.
1
Important
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.
Power Supply Attachment
Before inserting the power supply connector, always make sure that all components are
installed properly to ensure that no dam age will be caused. All power connectors on
the mainbnoard have to connect to the ATX power supply and have to work together to
ensure stable operation of the mainboard.
21
ATX 24-Pin Power Connector
This connector allows you to connect an ATX 24-pin power supply. To connect the ATX
24-pin power supply, make sure the plug of the power supply is inserted in the proper
orientation and the pins are aligned. Then push down the power supply firmly into the
connector.
You may use the 20-pin ATX power supply as you like. If you'd like to use the 20-pin ATX
power supply, please plug your power supply along with pin 1 & pin 13.
3
1
Keep Data (default)
12 24
GND
+3.3V
+5V
+12V
+5V
+12V
5VSB +5V
PWR OK NC
GND
GND
GND
+5V
GND GND
+5V PS-ON#
GND
GND
-12V
+3.3V
+3.3V
+3.3V
1 13
Installation Guide
1 3
Clear Data
En-15