Asus M4N78 Pro - Manual (Page 25)

1.9 Jumpers
1. Clear RTC RAM (CLRTC)
This jumper allows you to
clear the Real Time Clock
(RTC) RAM in CMOS. You can
clear the CMOS memory of
date, time, and system setup
parameters by erasing the
CMOS RTC RAM data. The
onboard button cell battery
powers the RAM data in
CMOS, which include system
setup information such as
system passwords.
To erase the RTC RAM
1. Turn OFF the computer and unplug the power cord.
2. Move the jumper cap from pins 1-2 (default) to pins 2-3. Keep the cap on pins 2-3
for about 5~10 seconds, then move the cap back to pins 1-2.
3. Plug the power cord and turn ON the computer.
4. Hold down the key during the boot process and enter BIOS setup to re-enter
data.
Except when clearing the RTC RAM, never remove the cap on CLRTC jumper default
position. Removing the cap will cause system boot failure!
• If the steps above do not help, remove the onboard battery and move the jumper again
to clear the CMOS RTC RAM data. After the CMOS clearance, reinstall the battery.
• You do not need to clear the RTC when the system hangs due to overclocking. For
system failure due to overclocking, use the C.P.R. (CPU Parameter Recall) feature. Shut
down and reboot the system so the BIOS can automatically reset parameter settings to
default values.
• Due to the chipset behavior, AC power off is required to enable C.P.R. function. You
must turn off and on the power supply or unplug and plug the power cord before
rebooting the system.
2. Keyboard power (3-pin KBPWR)
This jumper allows you to enable
or disable the keyboard wake-up
feature. Set this jumper to pins 2-3
(+5VSB) to wake up the computer
by pressing a key on the keyboard
(the default is the Space Bar). This
feature requires an ATX power
supply that can supply at least
1A on the +5VSB lead, and a
corresponding setting in the BIOS.
Chapter 1: Product introduction 1-15