Asus K8V - Manual (Page 64)

3-4 Chapter 3: Powering up
3.3 Powering off the computer
Using the OS shut down function
If you use Windows 98/98SE/ME/NT/2000, click the Start button, click
Shut Down..., make sure that the Shut down option button is selected,
then the OK button to shut down the computer. The power supply should
turn off after Windows shuts down.
If you use Windows XP, click the Start button, click Turn Off Computer,
then the Turn Off button to shut down the computer. The power supply
should turn off after Windows shuts down.
Using the dual function power switch
While the system is ON, pressing the power switch for less than 4 seconds
puts the system to sleep mode or to soft-off mode, depending on the BIOS
setting. Pressing the power switch for more than 4 seconds lets the
system enter the soft-off mode regardless of the BIOS setting. See section
“4.5 Power Menu” in Chapter 4.