Asus q503ua E-Manual page 22

Volume button
This button turns the volume up or down on your Notebook PC.
Power button
Press the power button to turn your Notebook PC on or off. You
can also use the power button to put your Notebook PC to sleep
or hibernate mode and wake it up from sleep or hibernate mode.
In the event that your Notebook PC becomes unresponsive,
press and hold the power button for at least four (4) seconds
until your Notebook PC shuts down.
22 Notebook PC E-Manual