Lenovo Y40-70 - Manual (Page 33)

Chapter 4. Troubleshooting
27
Troubleshooting
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Display problems
When I turn on the computer, 
nothing appears on the screen.
• If the screen is blank, make sure that:
- The AC power adapter is connected to the computer, and
the power cord is plugged into a working electrical outlet.
- The computer power is on. (Press the Power button again
for confirmation.)
- The memory is installed correctly.
• If these items are properly set, and the screen remains blank,
have the computer serviced.
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 its original factory
contents using the Lenovo OneKey Recovery System. If you
still see only the cursor on the screen, have the computer
serviced.
The 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 mode:
- Touch the touchpad.
- Press any key on the keyboard.
- Press the Power button.
- Press Fn + F2 to confirm whether the backlight of the LCD
screen has been turned off.
BIOS password problems
I forgot my password. • If you forget your user password, ask the system
administrator to clear your user password.
• If you forget your hard disk drive password, a Lenovo
authorized servicer cannot reset your password or recover
data from the hard disk. You must take your computer to a
Lenovo authorized servicer or a marketing representative to
have the hard disk drive replaced. Proof of purchase is
required, and a fee will be charged for parts and service.
• If you forget your administrator password, a Lenovo
authorized servicer cannot reset your password. You must
take your computer to a Lenovo authorized servicer or a
marketing representative to have the system board
replaced. Proof of purchase is required, and a fee will be
charged for parts and service.