Computer Screen Problems - Lenovo 3000 C Series Service And Troubleshooting Manual

Problem: The "critical low-battery error" message appears, and the computer immediately
turns off.
Solution: The battery power is getting low. Connect the ac adapter to the computer, or replace the
battery with a fully charged one.
Problem: When you press Fn to return from standby mode, the computer display remains blank.
Solution: Check whether an external monitor was disconnected or turned off while the computer
was in standby mode. If you disconnected or turned off the external monitor, connect it
or turn it on before resuming the computer from the standby mode. When resuming the
computer from the standby mode without attaching the external monitor or turning it
on, and the computer display remains blank, press Fn+F7 to bring up the computer
display.
Note: If you use the Fn+F7 key combination to apply a presentation scheme, press
Fn+F7 at least three times in three seconds, and the image is displayed on the computer
screen.
Problem: The computer does not return from standby mode, or the power and standby indicators
stays on and the computer does not work.
Solution: If the system does not return from standby mode, it may have entered standby or
hibernation mode automatically because the battery is depleted. Check the standby
indicator.
v If the standby indicator is on, your computer is in standby mode. Connect the ac
adapter to the computer; then press Fn.
v If the standby indicator is off, your computer is in hibernation mode or power-off
state. Connect the ac adapter to the computer; then press power button to resume
operation.
If the system still does not return from standby mode, your system may stop responding
and you cannot turn off the computer. In this case, you need to reset the computer. If
you have not saved your data, it may be lost. To reset the computer, press and hold the
power button for 4 seconds or more. If the system is still not reset, remove the ac
adapter and the battery.

Computer screen problems

Problem: The screen is blank.
Solution: Press Fn+F7 to bring up the image.
Note: If you use the Fn+F7 key combination to apply a presentation scheme, press
Fn+F7 at least three times in three seconds, and the image is displayed on the computer
screen.If you are using the ac adapter, or using the battery, and the battery status
indicator is on (is green), press Fn+F11 to make the screen brighter.
If the problem persists, do the Solution in the following problem "The screen is
unreadable of distorted."
Solving computer problems
Chapter 3. Solving computer problems
15