Asus M3N-HD - Manual (Page 102)

4-34 Chapter 4: BIOS setup
2. Press any key to continue. The password field setting is changed to [Clear].
A note about passwords
The Supervisor password is required to enter the BIOS Setup program
preventing unauthorized access. The User password is required to boot the
system preventing unauthorized use.
Forgot your password?
If you forget your password, you can clear it by erasing the CMOS Real Time
Clock (RTC) RAM. The RAM data containing the password information is
powered by the onboard button cell battery. If you need to erase the CMOS
RAM, refer to section 2.6 Jumper for instructions.
Password Check
This field requires you to enter the password before entering the BIOS setup or the
system. Select [Setup] to require the password before entering the BIOS Setup.
Select [System] to require the password before entering the system.
Configuration options: [Setup] [System]