The problem could be a faulty inverter board or faulty CCFL lamp in the monitor. The problem could also be a faulty video card.
Connect another monitor to the computer to determine if the video card is OK. If it is OK then the problem could be the back-light fault caused by faulty inverter or CCFL lamp.
For service, parts and DIY info check out LCD Parts - click on this link to their WEB site :- www.lcdparts.net
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