Asus M2N-LR/SATA - Manual (Page 93)

-0 Chapter : BIOS setup
Exit & Discard Changes
Select this option only if you do not want to save the changes that you made to
the Setup program. If you made changes to fields other than System Date, System
Time, and Password, the BIOS asks for a confirmation before exiting.
Discard Changes
Allows you to discard the selections you made and restore the previously saved
values. After selecting this option, a confirmation appears. Select Ok to discard any
changes and load the previously saved values.
Load Setup Defaults
Allows you to load the default values for each of the parameters on the Setup
menus. When you select this option or if you press <F5>, a confirmation window
appears. Select Ok to load default values. Select Exit & Save Changes or make
other changes before saving the values to the non-volatile RAM.