Computer is asleep or turned off
Desktop computer or laptop
Move the mouse or press an action key on the keyboard (Esc, Enter, Space Bar)
If the computer does not wake up, check to make sure the computer and monitor is on.
For laptops, press the power button once as it may be in Sleep Mode.
Look at screen and see if it turns on, if not, continue to the next step
If both the computer and monitor are on, power off the computer and wait 15 seconds.
Turn on the computer by pressing the power button once.