Lenovo IdeaPad Y550P User Manual page 53

When I turn on the computer, only a white cursor appears on a blank
screen.
Restore backed-up files to your Windows environment or the entire
contents of your hard disk to the original factory contents using OneKey
Recovery. If you still see only the cursor on the screen, have the computer
serviced.
My screen goes blank while the computer is on.
Your screen saver or power management may be enabled. Do one of the
following to exit from the screen saver or to resume from sleep or
hibernation mode:
Touch the touch pad.
Press any key on the keyboard.
Press the power button.
Press Fn+F2 to confirm whether the LCD screen has been turned off.
Chapter 5. Troubleshooting
45