2.5 Turning off the computer
While the system is ON, pressing the powe r switch for le ss than four se conds
puts the system on sleep mode or soft-off mode, depending on the BIOS setting.
Pressing the power switch for more than four seconds lets the system enter the
soft-off mode regardless of the BIOS setting. Refer to section 3.7 Boot Menu for
details.
ASUS P9X79 WS 2-51