Abit BF6 User Manual page 21

Installing the Motherboard
Normal Operation (Default) Discharge CMOS
Figure 2-6. CCMOS jumper setting
Before you clear the CMOS, you have to turn the power off first (including the +5V
standby power). Otherwise, your system may work abnormally or malfunction.
PN1 and PN2 Headers
PN1 (Pin 1-2-3-4-5): Power LED and Keylock Switch Headers
power LED light will not illuminate correctly.
Note
PN1 and PN2 are for switches and indicators
for the chassis's front panel, there are
several functions that come from these two
headers. You have to watch the pin position
and the orientation, or you may cause
system malfunctions. Figure 2-7 shows you
the PN1 and PN2 functions of the pins.
Figure 2-7. The definition of PN1 and
PN2 pins
There is a specific orientation for pins 1
through 3. Insert the three-threaded power
LED cable to pins 1~3, and the two-threaded
keylock cable into pin 4 and pin 5. Check to
make sure the correct pins go to the correct
connectors on the motherboard. If you
install them with the wrong direction, the
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User's Manual