Turning Off The Computer - Asus MAXIMUS IV EXTREME-Z User Manual

2.5

Turning off the computer

While the system is ON, pressing the power switch for less than four seconds
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.
ASUS Maximus IV Extreme-Z 2-57