Lenovo 3000 N200 Notebook - Manual (Page 28)

Computer screen problems
Problem: The screen is blank.
Solution:
Do the following:
v 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.
v 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.
v If the sleep status indicator is on (is green), press any key or the
power button to resume from the sleep mode.
v If you still have the problem, do the Solution in the following
problem ″The screen is unreadable or distorted."
Solving computer problems
18 Lenovo 3000 N200 Service and Troubleshooting Guide