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2-22 Chapter 2: Hardware information
Chapter 2
2.2.7 Jumper
1. Clear RTC RAM (3-pin 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.
Except when clearing the RTC RAM, never remove the cap on CLRTC jumper default position.
Removing the cap will cause system boot failure!
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 <Del> key during the boot process and enter BIOS setup to re-enter
data.
• 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.