Asus Motherboard P5ND2 - Manual (Page 91)

ASUS P5ND2 2-45
Load Setup Defaults
This option 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 Yes to load default values. Select
Exit & Save Changes or make other changes before saving the values to the
non-volatile RAM.
Discard Changes
This option allows you to discard the selections you made and restore the
previously saved values. After selecting this option, a confirmation appears.
Select Yes to discard any changes and load the previously saved values.