Asus Motherboard M2V-MX - Manual (Page 83)

ASUS M2V-MX 2-41
If you attempt to exit the Setup program without saving your changes,
the program prompts you with a message asking if you want to save
your changes before exiting. Press to save the changes while
exiting.
Exit & Save Changes
Once you are finished making your selections, choose this option from
the Exit menu to ensure that the values you selected are saved to the
CMOS RAM. An onboard backup battery sustains the CMOS RAM and
stays on even when the PC is turned off. When you select this option, a
confirmation window appears. Select Yes to save changes and exit.
2.8 Exit menu
The Exit menu items allow you to load the optimal or failsafe default values
for the BIOS items, and save or discard your changes to the BIOS items.
Exit Options
Exit & Save Changes
Exit & Discard Changes
Discard Changes
Load Setup Defaults
Pressing does not immediately exit this menu. Select one of the
options from this menu or from the legend bar to exit.
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.