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Check for bad caps with bulging tops/bottom seals in the power supply first, very common problem in all LCD monitors as you can see in my albums here: Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm/
Sounds like the lcd ribbon might have come loose. Or the lcd screen itself needs to be replaced. I have included a link here. The website shows detailed pictures about how to access the parts needed to fix this problem.
The ribbon i'm speaking of is just like the vga cable you use on a normal monitor. Since there is a limited amount of space in notebooks they turned this thick cable into a small flat ribbon.
Try to look and make sure all the connections are tight and as they should be. If nothing changes you will have to change the LCD display.
my problem was fixed by viziks from FixYa dated Sep 12
replaced 2 push pull transistors 2sc5707 in high voltage transformer circuit
Transformer used for backlight lamps
Both monitors now working THANKS VIZIKS