Lenovo IdeaPad Z510 Notebook - Manual (Page 31)

Chapter 4. Troubleshooting
27
Sleep problems
The critical low-battery error
message appears, and the
computer immediately turns off. • The battery power is getting low. Connect the AC power
adapter to the computer.
The computer enters sleep
mode immediately after
Power-on. • Make sure that:
- The battery is charged.
- The operating temperature is within the acceptable range.
See “Chapter 2. Use and care Information” in the Lenovo
Safety and General Information Guide.
Note: If the battery is charged and the temperature is within range, have the computer serviced.
The computer does not return
from sleep mode and the
computer does not work. • If your computer is in sleep mode, connect the AC power
adapter to the computer, then press the Power button.
• If your computer is powered-off, connect the AC power
adapter to the computer, then press the Power button to
resume operation.
Note: If the system still does not return from sleep mode, your system has stopped responding, and you cannot
turn off the computer; reset the computer. Unsaved data may be lost. To reset the computer, press and
hold the Power button for five seconds or more. If the computer still does not reset, remove the AC
power adapter.
Display panel problems
The screen is blank. • Do the following:
- If you are using the AC power adapter or the battery, and
the battery status indicator is on, press F12 ( ) to
make the screen brighter.
- If the power indicator is blinking, press the Power button
to resume from sleep mode.
- If the problem persists, follow the solution in the next
problem “The screen is unreadable or distorted.”
- Press F9 ( ) to confirm whether the backlight of the
LCD screen has been turned off.
The screen is unreadable or
distorted. • Make sure that:
- The display device driver is installed correctly.
- The screen resolution and color quality are correctly set.
- The monitor type is correct.
Incorrect characters appear on
the screen. • Is the operating system or programs installed correctly?
If they are installed and configured correctly, have the
computer serviced.