Usually this is a problem with the backlight, or inverter. Most of the time the inverter is the problem which is a pretty cheap fix. If its the backlight, then you will have to replace the lcd, which is much more expensive.
Normally this is caused by the power inverter for the
lcd.
It is a small circuit board right below the lcd, that powers the
backlight. If you take off the front bezel of the laptop you should be
able to see it, it will have a 2 wire power cord coming out the one
end, and another
plug in on the other end with several wires.
Check ebay for a replacment but make sure you get an identical model as the one you have, as they are very specific to each laptop. The inverter will have the part number written on it.
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